ORCID Profile
0000-0003-3806-0415
Current Organisations
University of Manchester
,
Monash University
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Metals and Alloy Materials | Manufacturing Engineering | Functional Materials | Manufacturing Processes and Technologies (excl. Textiles) | Materials Engineering | Composite and Hybrid Materials | Materials Engineering not elsewhere classified |
Expanding Knowledge in the Earth Sciences | Expanding Knowledge in the Physical Sciences | Structural Metal Products | Expanding Knowledge in Engineering | Manufacturing not elsewhere classified | Expanding Knowledge in Technology
Publisher: ASTM International
Date: 19-06-2014
Publisher: Trans Tech Publications, Ltd.
Date: 03-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.753.42
Abstract: The texture and microstructure evolution during uniaxial compression of Zircaloy-4 at 500C has been studied. X-ray diffraction was used to measure the bulk texture compressive after strains of 20% and 50%. Early stages of texture evolution involve the strengthening of the fibre through the action of prismatic slip. With further deformation, the basal poles move toward the rolling direction from the normal direction as a result of a non-prismatic slip system. A detailed EBSD study in a small region showed that the grains of the fibre are more stable than those of the fibre. The latter rotates further during deformation and shows a greater spread of grain average misorientation (GAM). This could be due to a greater accommodation of plastic strain in these grains and/or a difference in recovery rates between the two fibres.
Publisher: Elsevier BV
Date: 2019
Publisher: Elsevier BV
Date: 07-2021
Publisher: Springer Science and Business Media LLC
Date: 10-2002
Publisher: Elsevier
Date: 2013
Publisher: Springer Science and Business Media LLC
Date: 03-06-2019
Publisher: Elsevier BV
Date: 07-2017
Publisher: ASTM International
Date: 07-2021
Publisher: Elsevier BV
Date: 11-2015
Publisher: The Electrochemical Society
Date: 25-10-2017
Publisher: Elsevier BV
Date: 05-2017
Publisher: Elsevier BV
Date: 09-2021
Publisher: Elsevier BV
Date: 11-2016
Publisher: Informa UK Limited
Date: 07-2012
Publisher: Elsevier BV
Date: 03-2015
Publisher: International Union of Crystallography (IUCr)
Date: 08-03-2016
DOI: 10.1107/S1600576716002302
Abstract: Three-dimensional X-ray orientation microscopy based on X-ray full-field imaging techniques such as diffraction contrast tomography is a challenging task when it comes to materials displaying non-negligible intragranular orientation spread and/or intricate grain microstructures as a result of plastic deformation and deformation twinning. As shown in this article, the optimization of the experimental conditions and a number of modifications of the data analysis routines enable detection and three-dimensional reconstruction of twin lamellae down to micrometre thickness, as well as more accurate three-dimensional reconstruction of grains displaying intragranular orientation spreads of up to a few degrees. The reconstruction of spatially resolved orientation maps becomes possible through the use of a recently introduced six-dimensional reconstruction framework, which has been further extended in order to enable simultaneous reconstruction of parent and twin orientations and to account for the finite impulse response of the X-ray imaging detector. The simultaneous reconstruction of disjoint orientation domains requires appropriate scaling of the scattering intensities based on structure and Lorentz factors and yields three-dimensional reconstructions with comparable density values for all the grains. This in turn enables the use of a global intensity-guided assembly procedure and avoids problems related to the single-grain thresholding procedure used previously. Last but not least, carrying out a systematic search over the list of known twin variants (forward modelling) for each of the indexed parent grains, it is possible to identify additional twins which have been left undetected at the previous stage of grain indexing based on diffraction spot peak positions. The enhanced procedure has been tested on a 1% deformed specimen made from a Ti–4% Al alloy and the result has been cross-validated against a two-dimensional electron backscatter diffraction orientation map acquired on one of the lateral s le surfaces.
Publisher: Elsevier BV
Date: 11-2013
Publisher: Laser Institute of America
Date: 2007
DOI: 10.2351/1.5061002
Publisher: Elsevier BV
Date: 12-2010
Publisher: Elsevier BV
Date: 09-2021
Publisher: Elsevier BV
Date: 07-2019
Publisher: Elsevier BV
Date: 11-2017
Publisher: ASTM International
Date: 2018
Publisher: Elsevier BV
Date: 02-2009
Publisher: Elsevier BV
Date: 11-2006
Publisher: ASTM International
Date: 2018
Publisher: Elsevier BV
Date: 07-2018
Publisher: Elsevier BV
Date: 11-2014
Publisher: Elsevier BV
Date: 2019
Publisher: Informa UK Limited
Date: 08-02-2016
Publisher: Wiley
Date: 03-10-2015
DOI: 10.1111/JACE.13945
Publisher: Elsevier BV
Date: 12-2015
Publisher: Elsevier BV
Date: 2015
Publisher: EDP Sciences
Date: 2014
Publisher: Informa UK Limited
Date: 09-2006
Publisher: Elsevier BV
Date: 12-2023
Publisher: Elsevier BV
Date: 04-2012
Publisher: ASTM International
Date: 2018
Publisher: Elsevier BV
Date: 06-2019
Publisher: Elsevier BV
Date: 11-2014
Publisher: Elsevier BV
Date: 10-2020
Publisher: ASTM International
Date: 2018
Publisher: Laser Institute of America
Date: 2006
DOI: 10.2351/1.5060815
Publisher: ASTM International
Date: 2018
Publisher: Elsevier BV
Date: 12-2012
Publisher: Elsevier BV
Date: 11-2016
Publisher: Informa UK Limited
Date: 05-2012
Publisher: Elsevier BV
Date: 11-2018
Publisher: Elsevier BV
Date: 09-2008
Publisher: Crossref
Date: 2004
Publisher: Elsevier BV
Date: 11-2009
Publisher: Elsevier BV
Date: 2009
Publisher: Springer Science and Business Media LLC
Date: 17-01-2023
DOI: 10.1038/S41467-022-35706-3
Abstract: Understanding corrosion mechanisms is of importance for reducing the global cost of corrosion. While the properties of engineering components are considered at a macroscopic scale, corrosion occurs at micro or nano scale and is influenced by local microstructural variations inherent to engineering alloys. However, studying such complex microstructures that involve multiple length scales requires a multitude of advanced experimental procedures. Here, we present a method using correlated electron microscopy techniques over a range of length scales, combined with crystallographic modelling, to provide understanding of the competing mechanisms that control the waterside corrosion of zirconium alloys. We present evidence for a competition between epitaxial strain and growth stress, which depends on the orientation of the substrate leading to local variations in oxide microstructure and thus protectiveness. This leads to the possibility of tailoring substrate crystallographic textures to promote stress driven, well-oriented protective oxides, and so to improving corrosion performance.
Publisher: Springer Science and Business Media LLC
Date: 02-2018
Publisher: Elsevier BV
Date: 09-2003
Publisher: ASTM International
Date: 2018
Publisher: Elsevier BV
Date: 02-2016
Publisher: Trans Tech Publications, Ltd.
Date: 07-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.278.144
Abstract: Understanding the relationship between deformation mechanisms and microstructure is essential if one wants to fully exploit the potential of advanced nickel base superalloys and develop future alloys. In the present work, the influence of the lattice misfit between and ’ has been studied by means of in-situ loading experiments using neutron diffraction in combination with crystal plasticity modelling on RR1000 and Alloy 720Li. Both alloys were processed to generate three simplified uni-modal γ’ microstructures to allow determination of γ’ responses and experiments were carried out at 750°C. The results showed that a positive misfit strain increases the level of load partitioning from to ’ during plastic deformation introduced by uniaxial tensile loading.
Publisher: Springer Science and Business Media LLC
Date: 02-2011
Publisher: Elsevier BV
Date: 02-2017
Publisher: Elsevier BV
Date: 03-2009
Publisher: EDP Sciences
Date: 2014
Publisher: Elsevier BV
Date: 07-2007
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 02-2015
DOI: 10.1016/J.MICRON.2014.10.004
Abstract: Here we report a methodology combining TEM, STEM, Transmission-EBSD and EELS to analyse the structural and chemical properties of the metal-oxide interface of corroded Zr alloys in unprecedented detail. TEM, STEM and diffraction results revealed the complexity of the distribution of suboxide grains at the metal-oxide interface. EELS provided accurate quantitative analysis of the oxygen concentration across the interface, identifying the existence of local regions of stoichiometric ZrO and Zr3O2 with varying thickness. Transmission-EBSD confirmed that the suboxide grains can be indexed with the hexagonal ZrO structure predicted with ab initio by Nicholls et al. (2014). The t-EBSD analysis has also allowed for the mapping of a relatively large region of the metal-oxide interface, revealing the location and size distribution of the suboxide grains.
Publisher: Elsevier BV
Date: 06-2007
Publisher: Cambridge University Press (CUP)
Date: 06-2009
DOI: 10.1154/1.3175973
Publisher: Elsevier BV
Date: 06-2013
Publisher: Elsevier BV
Date: 2015
Publisher: ASTM International
Date: 08-2011
Publisher: Springer Science and Business Media LLC
Date: 04-02-2019
DOI: 10.1007/S11661-018-05102-Y
Abstract: Accurate prediction of the residual stress distributions in steel welds can only be achieved if consideration is given to solid-state phase transformation behavior. In this work, we assess the ability of a model for reaction kinetics to predict the phase transformations, and corresponding evolution of volumetric strain, in a nuclear pressure vessel steel when subjected to rapid weld-like thermal cycles. The cases under consideration involved the rapid heating of SA508 steel to a temperature of either 900 °C or 1200 °C for a period of 10 seconds, and subsequent cooling of the material to room temperature at rates between 0.1 and 100 °C s −1 . Predictions for the microconstituent proportions and transformation temperatures for each thermal cycle are compared to those measured through a combination of dilatometry, optical and electron microscopy, and synchrotron X-ray diffraction. In general, there was good agreement between measured and predicted transformation start temperatures and microconstituent fractions for cooling rates relevant to welding ( $$ \\ge $$ ≥ 10 °C s −1 ). Even in the cases in which discrepancies were found for start temperatures, examination of the corresponding dilatation curves showed a good match between predicted and experimental transformation strain evolution. This is a very positive result in terms of residual stress prediction in welds. At slower cooling rates, significant discrepancies arose owing to the model’s incapacity to predict Widmanstätten ferrite or retained austenite, and its failure to account for the effects of carbon redistribution during transformations involving diffusion. Although not relevant to welding, improvements to the model to rectify these issues would be beneficial in terms of its wider predictive capabilities.
Publisher: Trans Tech Publications, Ltd.
Date: 09-2004
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.1-2.147
Abstract: By combining modern surface strain measurement techniques with the traditional tensile test mechanical test, a method has been developed whereby the mechanical properties of a test s le with a heterogeneous microstructure such can be characterised in one test. In this paper the applicability to such a method of two such surface strain measurement techniques, image correlation (IC) and electronic speckle pattern interferometry (ESPI), is assessed. Two commercially available systems were used to monitor, simultaneously, the surface strain on tensile test specimens during testing. Measurements on homogeneous s les were compared with measurements made using strain gauges and excellent agreement was found. Elastic modulus and proof stress values measured in these standard s les showed that the uncertainty in the measurements was below 10%. The method was then applied to an inertia friction weld, whose strength varied linearly as a function of distance from the weld line. The values of proof stress obtained were compared with micro-hardness measurements.
Publisher: Elsevier BV
Date: 10-2009
Publisher: ASTM International
Date: 07-2021
Publisher: Elsevier BV
Date: 08-2014
Publisher: Elsevier BV
Date: 11-2009
Publisher: Elsevier BV
Date: 03-2004
Publisher: Elsevier BV
Date: 06-2009
Publisher: Elsevier BV
Date: 05-2007
Publisher: Crossref
Date: 2004
Publisher: Elsevier BV
Date: 11-2012
Publisher: Elsevier BV
Date: 04-2016
Publisher: Wiley
Date: 31-08-2016
Publisher: Elsevier BV
Date: 12-2015
Publisher: ASTM International
Date: 2009
DOI: 10.1520/STP48155S
Publisher: Elsevier BV
Date: 09-2015
Publisher: ASTM International
Date: 08-2011
Publisher: Elsevier BV
Date: 04-2004
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 03-2011
Publisher: Elsevier BV
Date: 02-2003
Publisher: Elsevier BV
Date: 05-2010
Publisher: Elsevier BV
Date: 02-2017
Publisher: Elsevier BV
Date: 12-2012
Publisher: ASTM International
Date: 07-2021
Publisher: Elsevier BV
Date: 03-2018
Publisher: Crossref
Date: 2004
Publisher: Elsevier BV
Date: 02-2016
Publisher: SAGE Publications
Date: 03-12-2008
Abstract: Machining, surface treatment, plastic forming and stretching, welding, and other manufacturing processes introduce residual stresses and distortion into work pieces and engineering components. These phenomena exert a significant influence on the behaviour of components affecting the response to thermal/mechanical in-service loading, e.g. in terms of crack initiation and propagation under the conditions of creep and fatigue, thus ultimately affecting their durability. In the present study, the inertia friction welding process is considered that is used for butt joining of hollow cylindrical components, such as shafts and drums. An inverse eigenstrain framework is used for the interpretation of neutron diffraction measurements in terms of the underlying eigenstrain distributions. Eigenstrain distributions that describe the nature of permanent inelastic deformation are found by minimizing the sum-of-squares measure of the disagreement between model prediction and experimental measurements of residual elastic strains. Experimental data obtained from neutron diffraction measurements are used in an inverse solution scheme in order to determine the underlying eigenstrain (strains permanently ‘locked in’) that give rise to the residual stress state. Once these are found, approximate reconstruction of the complete stress tensor within the entire component becomes straightforward. Eigenstrain distributions are first obtained for reduced size test specimens which have been characterized in detail using neutron diffraction. Subsequently, the eigenstrain distributions are scaled and applied to more complex, full-size real engine components, with scaling factors adjusted to match surface hole drilling measurements.
Publisher: Springer Science and Business Media LLC
Date: 23-02-2021
DOI: 10.1038/S41598-021-83859-W
Abstract: Zirconium alloys are used in safety–critical roles in the nuclear industry and their degradation due to ingress of hydrogen in service is a concern. In this work experimental evidence, supported by density functional theory modelling, shows that the α-Zr matrix surrounding second phase particles acts as a trapping site for hydrogen, which has not been previously reported in zirconium. This is unaccounted for in current models of hydrogen behaviour in Zr alloys and as such could impact development of these models. Zircaloy-2 and Zircaloy-4 s les were corroded at 350 °C in simulated pressurised water reactor coolant before being isotopically spiked with 2 H 2 O in a second autoclave step. The distribution of 2 H, Fe and Cr was characterised using nanoscale secondary ion mass spectrometry (NanoSIMS) and high-resolution energy dispersive X-ray spectroscopy. 2 H − was found to be concentrated around second phase particles in the α-Zr lattice with peak hydrogen isotope ratios of 2 H/ 1 H = 0.018–0.082. DFT modelling confirms that the hydrogen thermodynamically favours sitting in the surrounding zirconium matrix rather than within the second phase particles. Knowledge of this trapping mechanism will inform the development of current understanding of zirconium alloy degradation through-life.
Publisher: Elsevier BV
Date: 2016
Publisher: Cambridge University Press (CUP)
Date: 06-2008
DOI: 10.1154/1.2951868
Publisher: American Vacuum Society
Date: 11-03-2014
DOI: 10.1116/1.4867475
Abstract: S les of cerium were exposed to hydrogen under controlled conditions causing cerium hydride sites to nucleate and grow on the surface. The hydriding rate was measured in situ, and the hydrides were characterised using secondary ion mass spectrometry, scanning electron microscopy, and optical microscopy. The results show that the hydriding rate proceeded more quickly than earlier studies. Characterisation confirmed that the hydrogen is confined to the sites. The morphology of the hydrides was confirmed to be oblate, and stressed material was observed surrounding the hydride, in a number of cases lathlike features were observed surrounding the hydride sites laterally with cracking in the surface oxide above them. It is proposed that during growth the increased lattice parameter of the CeH2 induces a lateral compressive stress around the hydride, which relieves by the ca. 16% volume collapse of the γ-Ce to α-Ce pressure induced phase transition. Cracking of the surface oxide above the laths reduces the diffusion barrier to hydrogen reaching the metal/oxide interface surrounding the hydride site and contributes to the anisotropic growth of the hydrides.
Publisher: Elsevier BV
Date: 08-2008
Publisher: International Union of Crystallography (IUCr)
Date: 11-03-2014
DOI: 10.1107/S1600576714000569
Abstract: The present article describes a modification to the standard method of glancing-angle X-ray diffraction for accurate measurement of the texture of thin oxide films. The technique resolves the problems caused by overlapping diffraction peaks originating from multiphase materials with asymmetric unit cells and the peak broadening associated with s le tilt during glancing-angle texture measurement. The entire 2θ range of interest is recorded as a function of s le orientation, and the integrated intensities from different crystallographic planes are extracted from fitted diffraction profiles. The technique allows for pole figures to be plotted from diffraction peaks that could otherwise not be resolved and separates contributions from neighbouring peaks, leading to a more accurate representation of the existing oxide texture. The proposed method has been used for determining texture in a 3 µm layer of monoclinic/tetragonal zirconium oxide grown during aqueous corrosion testing and has been verified by additional synchrotron X-ray diffraction measurements.
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 04-2017
Publisher: Wiley
Date: 02-05-2016
Publisher: Springer Science and Business Media LLC
Date: 21-02-2019
Publisher: Elsevier BV
Date: 02-2012
Publisher: Elsevier BV
Date: 08-2020
Publisher: ASTM International
Date: 07-2021
Publisher: Springer Science and Business Media LLC
Date: 10-04-2018
DOI: 10.1038/S41467-018-03875-9
Abstract: Hardfacing alloys provide strong, wear-resistant and corrosion-resistant coatings for extreme environments such as those within nuclear reactors. Here, we report an ultra-high-strength Fe–Cr–Ni silicide phase, named π-ferrosilicide, within a hardfacing Fe-based alloy. Electron diffraction tomography has allowed the determination of the atomic structure of this phase. Nanohardness testing indicates that the π-ferrosilicide phase is up to 2.5 times harder than the surrounding austenite and ferrite phases. The compressive strength of the π-ferrosilicide phase is exceptionally high and does not yield despite loading in excess of 1.6 GPa. Such a high-strength silicide phase could not only provide a new type of strong, wear-resistant and corrosion-resistant Fe-based coating, replacing more costly and hazardous Co-based alloys for nuclear applications, but also lead to the development of a new class of high-performance silicide-strengthened stainless steels, no longer reliant on carbon for strengthening.
Publisher: Elsevier BV
Date: 06-2013
Publisher: Elsevier BV
Date: 09-2015
Publisher: Elsevier BV
Date: 08-2020
Publisher: ASTM International
Date: 09-2010
Publisher: ASTM International
Date: 07-2010
Publisher: Springer Science and Business Media LLC
Date: 04-04-2012
Publisher: Elsevier BV
Date: 12-2014
Publisher: Wiley
Date: 20-12-2016
DOI: 10.1002/9783527808465.EMC2016.5821
Abstract: Polycrystalline nickel‐based superalloys for turbine disc applications typically employ complex alloy chemistry in order to produce a high volume fraction of gamma‐prime (γ′) precipitates for the optimisation of mechanical properties [1]. The precipitate coarsening causes a gradual loss of coherency between γ′ precipitates and γ matrix when materials serving elevated temperatures, therefore resulting in the degradation of its mechanical performance [2]. In this work, we report new experimental observations for diffusion‐mediated secondary γ′ precipitate coarsening (See Fig. 1) within a near‐zero misfit alloy RR1000 in a cyclic manner that these precipitates coarsen and split periodically [3]. Using absorption‐corrected energy‐dispersive X‐ray (EDX) spectroscopy within the scanning transmission electron microscope (STEM) [4], compositional variations for secondary γ′ precipitates as a function of coarsening behaviour under have been investigated. We have observed clear cyclic variations in the elemental concentrations of Co, Ti and Al within the secondary γ′ as a function of ageing time. STEM/EDX spectrum imaging and electron tomography on in idual secondary γ′ have revealed local enrichment of Co within the core of secondary γ′ (See Fig. 2). STEM‐EDX analysis of the γ‐γ′ interface revealed nanoscale enrichment of Co and Cr and a depletion of Al and Ti within the γ matrix region near the γ‐γ′ interface (See Fig. 3). Our experimental results, coupled with complementary modelling and synchrotron X‐ray diffraction analysis, demonstrate the importance of elastic strain energy resulting from local compositional variations for influencing precipitate morphology. In particular, we show that elemental inhomogeneities, produced within both matrix and precipitates, are induced by complex interactions between thermodynamics and diffusion kinetics. These elemental inhomogeneities will likely affect the kinetics of coarsening and therefore must be taken into account when predicting the microstructure likely to be produced when the material is exposed to different heat treatment regimes. More generally, our findings suggest the importance of considering diffusion kinetics when attempting to understand the microstructural evolution of advanced superalloys. Our discovery renders the potential to retain the overall γ‐γ′ coherence in nickel‐based superalloys when exposed to elevated temperatures, and therefore to improve its creep properties.
Publisher: Springer Science and Business Media LLC
Date: 14-04-2015
DOI: 10.1557/JMR.2015.89
Publisher: Elsevier BV
Date: 06-2020
Publisher: ASTM International
Date: 07-2021
Publisher: Elsevier BV
Date: 2015
Publisher: Springer Science and Business Media LLC
Date: 04-03-2023
DOI: 10.1038/S41467-020-18641-Z
Abstract: Twin boundaries (TBs) in Ni-based superalloys are vulnerable sites for failure in demanding environments, and a current lack of mechanistic understanding h ers the reliable lifetime prediction and performance optimisation of these alloys. Here we report the discovery of an unexpected γ″ precipitation mechanism at TBs that takes the responsibility for alloy failure in demanding environments. Using multiscale microstructural and mechanical characterisations (from millimetre down to atomic level) and DFT calculations, we demonstrate that abnormal γ″ precipitation along TBs accounts for the premature dislocation activities and pronounced strain localisation associated with TBs during mechanical loading, which serves as a precursor for crack initiation. We clarify the physical origin of the TBs-related cracking at the atomic level of γ″-strengthened Ni-based superalloys in a hydrogen containing environment, and provide practical methods to mitigate the adverse effect of TBs on the performance of these alloys.
Publisher: Springer Science and Business Media LLC
Date: 24-03-2020
DOI: 10.1038/S41598-020-62241-2
Abstract: Proton irradiation is often used as a proxy for neutron irradiation but the irradiated layer is typically μm deep this presents a problem when trying to obtain mechanical test data as a function of irradiation level. Two novel methodologies have been developed to record stress-strain curves for thin proton-irradiated surface layers of SA-508-4N ferritic steel. In the first case, in-situ loading experiments are carried out using a combination of X-ray diffraction and digital image correlation on the near surface region in order to measure stress and strain, thereby eliminating the influence of the non-irradiated volume. The second approach is to manufacture small-scale tensile specimens containing only the proton irradiated volume but approaching the smallest representative volume of the material. This is achieved by high-speed focused ion beam (FIB) milling though the application of a Xe + Plasma-FIB (PFIB). It is demonstrated that both techniques are capable of recording the early stage of uniaxial flow behaviour of the irradiated material with sufficient accuracy providing a measure of irradiation-induced shift of yield strength, strain hardening and tensile strength.
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 2008
Publisher: Wiley
Date: 02-2003
DOI: 10.1046/J.1365-2818.2003.01105.X
Abstract: In this paper, high-resolution tomographic synchrotron X-ray imaging is applied to study the occurrence and evolution of damage in Ti-6Al-4V/SCS6 SiC fibre composite materials. Three composite morphologies of increasing complexity have been studied, namely single fibre, single-ply and multi-ply composites. The single fibre composite was strained to full fibre fragmentation and the progressive introduction of damage monitored. For the single-ply composite, damage was introduced deliberately by laser drilling to establish the effect of damaged fibres on their neighbours, whereas for the multi-ply composite the morphology of a fibre bridging fatigue crack was studied. In addition to traditional mode I fibre fractures, subsequent fibre wedge cracks were observed presumably nucleating from damage introduced into the fibre surface by the first fracture event. In addition to these crack morphologies, spiral defects were observed for the single ply during failure. Finally, for the multi-ply composite, the matrix crack front showed a number of characteristic features, including advancement in fibre-free regions, crack bifurcation near fibres and different crack plane heights either side of a fibre.
Publisher: Elsevier BV
Date: 06-2020
Publisher: Springer Science and Business Media LLC
Date: 24-07-2019
Publisher: Trans Tech Publications, Ltd.
Date: 12-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.702-703.834
Abstract: The mechanical behaviour and texture evolution during uniaxial compression of Zircaloy-4 at different temperatures (25, 300, 500 C) has been studied. At room temperature and 300 C the texture evolution and strain-hardening behaviour observed are attributed to the activation of {10-12} tensile twinning, which can be identified in optical micrographs and electron backscatter diffraction (EBSD) data. The influence of twinning upon the texture evolution and hardening rate becomes less apparent with increasing temperature. Nevertheless twinning is still active at 500 C. Simulation of the texture evolution at 500 C using crystal plasticity finite element modelling (CPFEM) indicates that slip alone cannot explain the experimentally observed textures at this temperature.
Publisher: Informa UK Limited
Date: 12-2002
Publisher: Springer Science and Business Media LLC
Date: 09-07-2013
Publisher: Elsevier BV
Date: 05-2022
Publisher: Elsevier BV
Date: 08-2023
Publisher: International Union of Crystallography (IUCr)
Date: 08-2014
DOI: 10.1107/S160057671401406X
Abstract: A comparison of the performance of X-ray diffraction tomography, a near-field diffraction technique, and a far-field diffraction technique for indexing X-ray diffraction data of polycrystalline materials has been carried out by acquiring two sets of diffraction data from the same polycrystalline s le volume. Both approaches used in this study are variants of the three-dimensional X-ray diffraction (3DXRD) methodology, but they rely on different data-collection and analysis strategies. Previous attempts to assess the quality of 3DXRD indexing results from polycrystalline materials have been restricted to comparisons with two-dimensional electron backscatter diffraction cross sections containing a limited number of grains. In the current work, the relative performance of two frequently used polycrystalline-material indexing algorithms is assessed, comparing the indexing results obtained from a three-dimensional s le volume containing more than 1500 grains. The currently achievable accuracy of three-dimensional grain maps produced with these algorithms has been assessed using a statistical analysis of the measurement of the size, position and orientation of the grains in the s le. The material used for this comparison was a polycrystalline commercially pure titanium grade 2 s le, which has a hexagonal close-packed crystal structure. The comparison of the two techniques shows good agreement for the measurements of the grain position, size and orientation. Cross-validation between the indexing results shows that about 99% of the s le volume has been indexed correctly by either of these indexing approaches. The remaining discrepancies have been analysed and the strengths and limitations of both approaches are discussed.
Publisher: Elsevier BV
Date: 07-2018
Publisher: Laser Institute of America
Date: 2005
DOI: 10.2351/1.5060434
Publisher: Elsevier BV
Date: 2019
Publisher: Elsevier BV
Date: 04-2015
Publisher: Elsevier BV
Date: 06-2018
Publisher: Elsevier BV
Date: 09-2003
Publisher: Springer Science and Business Media LLC
Date: 31-01-2014
Publisher: Elsevier BV
Date: 2016
Publisher: Elsevier BV
Date: 02-2011
Publisher: Elsevier BV
Date: 10-2005
Publisher: Elsevier BV
Date: 05-2019
Publisher: Elsevier BV
Date: 08-2009
Publisher: Crossref
Date: 2004
Publisher: Elsevier BV
Date: 10-2015
Publisher: Oxford University Press (OUP)
Date: 08-2013
DOI: 10.1017/S143192761300768X
Abstract: Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.
Publisher: Elsevier BV
Date: 12-2017
Publisher: Elsevier BV
Date: 06-2002
Publisher: Trans Tech Publications, Ltd.
Date: 08-2007
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.7-8.119
Abstract: Electronic Speckle Pattern Interferometry (ESPI) is used in conjunction with a mechanical test rig to determine the tensile property response when loading cross weld tensile s les of Tungsten Inert Gas (TIG) and Electron Beam (EB) welded Inco718, which include the parent metal, Heat Affected Zone (HAZ) and weld metal. A comparison with cross weld micro hardness testing revealed that such results were misleading when compared with ESPI calculated Proof Stress (PS) variations across the weld region from the same specimens. The effects of ignoring weld related material property variations when modelling welded components are examined.
Publisher: International Union of Crystallography (IUCr)
Date: 05-09-2007
DOI: 10.1107/S0021889807030269
Abstract: The determination of residual stress by diffraction depends on the correct measurement of the strain-free lattice spacing d_{hkl}^0, or alternatively the enforcement of some assumption about the state of strain or stress within the body. It often represents the largest uncertainty in residual stress measurements since there are many ways in which the strain-free lattice spacing can vary in ways that are unrelated to stress. Since reducing this uncertainty is critical to improving the reliability of stress measurements, this aspect needs to be addressed, but it is often inadequately considered by experimenters. Many different practical strategies for the determining of d_{hkl}^0 or d ref have been developed, some well known, others less so. These are brought together here and are critically reviewed. In practice, the best method will vary depending on the particular application under consideration. Consequently, situations for which each method are appropriate are identified with reference to practical ex les.
Publisher: Informa UK Limited
Date: 2011
Publisher: Springer Science and Business Media LLC
Date: 29-04-2015
DOI: 10.1557/JMR.2015.65
Publisher: Elsevier BV
Date: 2020
Publisher: International Union of Crystallography (IUCr)
Date: 14-03-2013
DOI: 10.1107/S0021889813002604
Abstract: Diffraction contrast tomography is a near-field diffraction-based imaging technique that provides high-resolution grain maps of polycrystalline materials simultaneously with the orientation and average elastic strain tensor components of the in idual grains with an accuracy of a few times 10 −4 . Recent improvements that have been introduced into the data analysis are described. The ability to process data from arbitrary detector positions allows for optimization of the experimental setup for higher spatial or strain resolution, including high Bragg angles (0 2θ 180°). The geometry refinement, grain indexing and strain analysis are based on Friedel pairs of diffraction spots and can handle thousands of grains in single- or multiphase materials. The grain reconstruction is performed with a simultaneous iterative reconstruction technique using three-dimensional oblique angle projections and GPU acceleration. The improvements are demonstrated with the following experimental ex les: (1) uranium oxide mapped at high spatial resolution (300 nm voxel size) (2) combined grain mapping and section topography at high Bragg angles of an Al–Li alloy (3) ferrite and austenite crystals in a dual-phase steel (4) grain mapping and elastic strains of a commercially pure titanium s le containing 1755 grains.
Publisher: Laser Institute of America
Date: 2008
DOI: 10.2351/1.5057020
Publisher: Elsevier BV
Date: 05-2017
Publisher: Elsevier BV
Date: 10-2012
Publisher: EDP Sciences
Date: 2020
DOI: 10.1051/MATECCONF/202032106011
Abstract: Adsorption of hydrogen (H) can result in severe performance degradation of Ti alloys. In this study, the effect of H on the plasticity of Ti-5Al-7 5V-0.5Si (Ti575) alloy is investigated. High resolution digital image correlation (HRDIC) is employed to elucidate the effect of H on the strain distribution and dislocation slip character of the alloy during mechanical loading. It is found that H enhances slip heterogeneity and promotes the formation of long and sparse prismatic slip bands in the α phase, which can extend to across several grains. Such heterogenous prismatic slip bands are likely to originate from the lenticular hydrides, which have the prismatic plane as their habit plane. In addition, H also shows considerable effect on the plasticity of β phase, which facilitates the slip transmission and enhances the slip localisation.
Publisher: Springer Science and Business Media LLC
Date: 02-10-2013
Publisher: SAGE Publications
Date: 05-2009
Abstract: A method is presented for obtaining good images of s le surfaces at high temperatures, suitable for strain measurement, by digital image correlation (DIC) without the use of surface markers or speckles. This is accomplished by suppressing black-body radiation through the use of filters and blue illumination. Using only relatively low levels of illumination the method is demonstrated to be capable of providing accurate DIC measurements up to 1100 °C, and the potential to monitor strains to 1400 °C is identified. The capability of the method is demonstrated by measuring the Young's modulus and coefficient of thermal expansion of a nickel-base superalloy at temperatures from ambient to 1000 °C two parameters that are well established in the literature and that require high strain sensitivity for their reliable determination.
Publisher: Elsevier BV
Date: 04-2018
Publisher: Elsevier BV
Date: 12-0022
Publisher: Elsevier BV
Date: 03-2013
Publisher: The Electrochemical Society
Date: 09-2017
DOI: 10.1149/MA2017-02/41/1788
Abstract: Adventitious hydrogen uptake into engineering materials frequently occurs as a consequence of the corrosion process at cathodic sites and tends to compromise, often severely, the mechanical properties of the alloy leading particularly to reduced fracture toughness and ductility and increased brittleness. In light water reactors (LWR) oxidation of the zirconium fuel cladding, and also other reactor internal components, results in pickup of hydrogen into the metal and limits how long the cladding can remain in the reactor environment, hence limiting the efficient consumption (“burn-up”) of the nuclear fuel. The fraction of hydrogen that is picked up by the metal in service, and the rate of the hydrogen diffusion, are key factors in understanding this phenomenon. It is thus of considerable interest to have a better understanding of the kinetics of hydrogen entry and diffusion ermeation in reactor pressure vessel materials (i.e. austenitic stainless steels and nickel based alloys) and particularly fuel cladding (zirconium alloys) under realistic operating conditions. The main purpose of this research is to adapt the well-known Devanathan-Stachurski permeation cell, to measure hydrogen diffusion at temperatures in the range 100-300°C, Figure 1. The work is ided in two stages. Firstly, an electrochemical study and selection of the candidate electrolytes, reference (RE) and counter (CE) electrodes for the oxidation and reduction compartments of the cell, within the temperature range specified above has been carried out. Secondly, hydrogen permeation measurements will be carried out in order to measure the entry kinetics and diffusion coefficient of hydrogen in reactor materials. This current report is focused on the first phase of the work. To realise the Devanathan-Stachurski concept at higher temperatures requires the use of concentrated salt solutions, molten salts or ionic liquids. For this work two molten salt eutectic mixtures were selected: NaOH + KOH (49:51 by mass alkaline system) and NaHSO 4 + KHSO 4 (47:53 by mass acidic system). Both electrolytes rely on residual dissolved water to supply protons and, hence, a humidified argon gas flow was provided with which the electrolyte was equilibrated. Platinum was used as the counter electrode while silver was found to behave as a sufficiently stable pseudo-reference electrode under the experimental conditions. Preliminary polarization curves (Figures 2 and 3) using both molten salts are shown within the working temperature range for Zr (99.2% – i.e. commercial purity zirconium), Zr4 (Zr + 1.5% Sn, 0.3% Fe+Cr and 0.2% Fe – i.e. zircalloy 4) and 316SS (16-18%Cr, 10-14% Ni, 2-2.5% Ni – i.e. AISI 316 austenitic stainless steel). The results demonstrate cathodic kinetics consistent with hydrogen evolution and anodic kinetics consistent with passivation in both electrolytes. Although 316SS is consistently less stable (i.e. corrodes more) under anodic polarisation. The bisulphate eutectic provides better hydrogen evolution kinetics but was found to be unstable above about 250°C and so the sodium otassium hydroxide was selected as the electrolyte of choice. Conventionally, Devanathan-Stachurski cells operate under steady state (Fick’s 1 st Law) where the hydrogen activity is fixed on opposite sides of the permeation membrane. However in order to maximise the opportunity for detection of hydrogen given the extremely low diffusivity in zirconium, a protocol was adopted whereby the working electrode surface was first polarised into the cathodic region to evolve hydrogen then the potential was stepped into the anodic region to oxidise hydrogen. This concept is shown in figure 4. Figure 5 shows the results of two anodic polarisation in NaOH-KOH at 250°C from which it is clear that pre-polarisation into the cathodic region to evolve hydrogen results in a higher current that can be ascribed to the presence of hydrogen in the metal. Figure 1
Publisher: Elsevier BV
Date: 08-2018
Publisher: International Union of Crystallography (IUCr)
Date: 24-12-2010
DOI: 10.1107/S0021889810050077
Abstract: A titanium alloy s le (#6246) containing a linear friction weld has been imaged nondestructively using tomographic energy-dispersive diffraction imaging (TEDDI). The diffraction patterns measured at each point of the TEDDI image permitted identification of the material and phases present (±5%). The image also showed the preferred orientation and size–strain distribution present within the s le without the need for any further s le preparation. The preferred orientation was observed in clusters with average dimensions very similar to the experimental spatial resolution (400 µm). The length scales and preferred orientation distributions were consistent with orientation imaging microscopy measurements made by Szczepanski, Jha, Larsen & Jones [ Metall. Mater. Trans. A (2008), 39 , 2841–2851] where the microstructure development was linked to the grain growth of the parent material. The use of a high-energy X-ray distribution (30–80 keV) in the incident beam reduced systematic errors due to the source profile, s le and air absorption. The TEDDI data from each voxel were reduced to an angle-dispersive form and Rietveld refined to a mean χ 2 of 1.4. The mean lattice parameter error (δ d / d ) ranged from ∼10 −4 for the highly crystalline regions to ∼10 −3 for regions of very strong preferred orientation and internal strain. The March–Dollase preferred orientation errors refined to an average value of ±2%. A 100% correlation between observed fluorescence and diffraction peak broadening was observed, providing further evidence for vicinal strain broadening.
Publisher: Elsevier BV
Date: 10-2002
Publisher: Elsevier BV
Date: 11-2020
Publisher: Elsevier BV
Date: 2017
Publisher: Wiley
Date: 15-12-2010
Publisher: Trans Tech Publications, Ltd.
Date: 23-05-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.783-786.2602
Abstract: The crystallographic textures of flow formed parts are of great scientific interest as they result from a complex deformation mode that comprises strain components in the axial and hoop directions. In general they resemble those of the rolling type but with slight differences. The present paper analyses the effects of certain process parameters, such as roller contact angle, feed rate, and preform hardness, since these are crucial in defining the forces acting in each principal direction of the component. Additionally, the development of a texture gradient through the wall thickness is also discussed. Texture predictions from a crystal plasticity finite-element model were also employed to support the experimental data and interpret the deformation mechanisms. Finally, the erse nature of the flow formed textures is verified by annealing treatments at 700°C, which yields the typical gamma-fibre encountered in rolled ferritic steels upon recrystallisation in conjunction with the strengthening of the (113)[1-10] component.
Publisher: AIP Publishing
Date: 22-07-2022
DOI: 10.1063/5.0089048
Abstract: The speed-up of radiation science development with the advent of ion-irradiation experiments has, until recently, been omitted in the post-irradiation examination technique. This paper reports the results of transient grating spectroscopy—a rapid, non-destructive, in situ photothermal surface technique—of ion-irradiated single-crystals of iron, chromium, vanadium, and tungsten at room temperature. Thermal diffusivity was used to track damage development throughout irradiation, with 5 MeV self-ion irradiated iron, chromium, and vanadium showing little to no change up to damages of the order of 1 dpa. 5 MeV Si3+-ion irradiated tungsten exhibits a reduction of thermal diffusivity from 0.78(7) to 0.29(2) cm2 s−1 with logarithmically increasing dose over a similar damage range. A comparison to literature of transient grating spectroscopy thermal diffusivity values past and present shows good agreement radiation-induced change can be clearly distinguished from differences between mono- and poly-crystalline tungsten.
Publisher: Informa UK Limited
Date: 05-2009
Publisher: Springer Science and Business Media LLC
Date: 03-2007
Publisher: Elsevier BV
Date: 03-2020
Publisher: Elsevier BV
Date: 05-2006
Publisher: Informa UK Limited
Date: 09-2006
Publisher: Elsevier BV
Date: 02-2015
Publisher: Elsevier BV
Date: 09-2017
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 07-2009
Publisher: Annual Reviews
Date: 04-08-2012
DOI: 10.1146/ANNUREV-MATSCI-070511-155111
Abstract: This paper reviews progress using X-ray computed tomography to study damage accumulation. Since its introduction, X-ray microtomography has been used to diagnose the presence of damage. In this review, a wide range of damage-accumulation mechanisms are covered including cavitation, fracture, microcracking, fatigue cracking, and stress corrosion cracking. In this regard, the advantages of attenuation and phase contrast imaging are discussed. This review includes both measurements of damage accumulation, taken postmortem, and the incremental monitoring of damage-accumulation processes during life (sometimes termed four-dimensional tomography). In addition to the qualitative diagnostic studies, the quantitative analysis of tomography images to extract key failure parameters is examined.
Publisher: Springer Science and Business Media LLC
Date: 27-02-2015
DOI: 10.1007/S11661-015-2812-9
Abstract: A combination of mechanical testing, EBSD and crystal plasticity finite element modeling were used to investigate the influence of temperature on the fragmentation of grains in a zirconium alloy. The results demonstrate that grains of Zircaloy-4 fragment more as the temperature rises. This trend can be explained by an increasing difference between the CRSS values for 〈c+a〉 slip and 〈a〉 slip as temperature rises. This change in relative slip activities with temperature is supported by experimental observations of macroscopic anisotropy and in-grain misorientation axes calculated from EBSD data, as well as plasticity modeling. By tracking the microstructural evolution during deformation, it is shown that the two major texture components fragment to different degrees under the action of prismatic slip. Grains in the $$ \\left\\langle {11\\overline{2} 0} \\right\\rangle $$ 11 2 ¯ 0 fiber are significantly more stable than those in the $$ \\left\\langle {10\\overline{1} 0} \\right\\rangle $$ 10 1 ¯ 0 fiber, which break up. Grains of the latter fiber fragment heterogeneously as portions of the grain rotate in opposite directions, and some do not rotate at all.
Publisher: Elsevier BV
Date: 04-2019
Publisher: Elsevier BV
Date: 2013
Publisher: Elsevier BV
Date: 10-2016
Publisher: Springer Science and Business Media LLC
Date: 26-06-2007
Publisher: Elsevier BV
Date: 09-2018
Publisher: Elsevier BV
Date: 08-2011
Publisher: Elsevier BV
Date: 05-2018
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 02-2006
Publisher: Springer Science and Business Media LLC
Date: 11-2005
Publisher: Elsevier BV
Date: 09-2015
Publisher: Elsevier BV
Date: 09-2019
Publisher: Informa UK Limited
Date: 2005
Publisher: Elsevier BV
Date: 05-2020
Publisher: Laser Institute of America
Date: 2007
DOI: 10.2351/1.5060984
Publisher: Elsevier BV
Date: 08-2013
Publisher: Elsevier BV
Date: 09-2018
Publisher: Elsevier BV
Date: 02-2016
Publisher: EDP Sciences
Date: 2020
DOI: 10.1051/MATECCONF/202032111039
Abstract: Near-α Ti-alloys such as TIMETAL® 834 are known for their superior mechanical properties at high temperature, and as such are found in applications where high strength and improved fatigue performance at elevated temperatures ( °C) are required. However, these alloys can be susceptible to cold-dwell fatigue a failure mechanism that is not well understood. The present work investigates the strain localisation behaviour during cold creep and the implications it has in terms of dwell susceptibility for two different bi-modal microstructures. Slip traces and strain distributions have been analysed for different material conditions by employing High-Resolution Digital Image Correlation (HRDIC) in combination with orientation mapping. Using this approach, it was possible to distinguish deformation patterns in primary α grains and transformed-β colonies, loaded incrementally to stress levels of 70%, 80% and 90% of the yield stress. Different prior β-grain morphologies didn’t affect the average strains when stresses are low but strain distributions have been affected by the β-grain morphology. Material with coarse transformation product accumulated larger amounts of plastic strain compared to material with fine transformation product, at the same relative stress levels. At low stress levels, slip bands have been detected both in primary α, as well in the transformed-β phase, cutting through the lamellae, for the material condition with a coarse transformation product on the other hand, for the material conditions with a fine transformation product, slip bands are localised only in primary α grains at low stress levels. It was also found for both conditions that at low stress levels slip bands are found in grains that are well oriented for basal slip. Based on these observations it is discussed if b-ligaments are significant obstacles to dislocation movement. Finally, the requirement of crystal-plasticity modelling to take into account differences in crystallographic orientations and the elastic and plastic anisotropy of HCP-titanium will be discussed and considered.
Publisher: Springer Science and Business Media LLC
Date: 08-2005
Publisher: Trans Tech Publications, Ltd.
Date: 05-2010
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.652.19
Abstract: The current study investigates the effect of foreign object damage (FOD) on the pre-existing compressive residual stress field associated with laser shock peening (LSP) and its evolution upon combined LCF/HCF cycling. FOD was introduced onto an aerofoil-shaped specimen that had been previously LSP treated through ballistic impacts at angles of 0° and 45° to the leading edge. It is shown that the FOD notch created by 45° impact was asymmetric in shape and smaller in depth compared to that created at 0° impact. Significant through thickness compression was introduced parallel to the leading edge as a result of the LSP process. The residual strain distribution was mapped around the FOD notch by synchrotron X-ray radiation. The results show predominantly compressive stresses ahead of the notch, being greater for the 0 compared to 45 impact. No significant stress relaxation was observed after a combined (1000 HCF cycles superimposed on 1 LCF cycle) cycle.
Publisher: Elsevier BV
Date: 11-2014
Publisher: EDP Sciences
Date: 2020
DOI: 10.1051/MATECCONF/202032111040
Abstract: For titanium alloys, crack initiation as a result of plastic strain accumulation has been shown to govern fatigue life under the high cycle fatigue regime. In this study, the early plastic slip activity and fatigue crack initiation was studied using a cyclic four point bending test at 10 Hz with a load ratio of 0.1, up to 90% of the proof stress. The plastic slip in the high stress area was monitored by interrupting the test and performing optical microscopy. Following fatigue crack initiation, scanning electron microscopy (SEM) combined with electron backscatter diffraction (EBSD) was used to identify the slip and crack initiation mode in a 600 x 600 μm 2 area. Using slip trace analysis, it was shown that primary alpha grains offered dominant plastic deformation with basal slip activation. Cracking along basal planes was determined to be the dominant damage mode.
Publisher: Springer Science and Business Media LLC
Date: 06-11-2019
DOI: 10.1007/S11661-019-05492-7
Abstract: Nanocrystalline materials reveal excellent mechanical properties but the mechanism by which they deform is still debated. X-ray line broadening indicates the presence of large heterogeneous strains even when the average grain size is smaller than 10 nm. Although the primary sources of heterogeneous strains are dislocations, their direct observation in nanocrystalline materials is challenging. In order to identify the source of heterogeneous strains in nanocrystalline materials, we prepared Pd-10 pct Au specimens by inert gas condensation and applied high-pressure torsion (HPT) up to γ ≅ 21. High-resolution transmission electron microscopy (HRTEM) and molecular dynamic (MD) simulations are used to investigate the dislocation structure in the grain interiors and in the grain boundary (GB) regions in the as-prepared and HPT-deformed specimens. Our results show that most of the GBs contain lattice dislocations with high densities. The average dislocation densities determined by HRTEM and MD simulation are in good correlation with the values provided by X-ray line profile analysis. Strain distribution determined by MD simulation is shown to follow the Krivoglaz–Wilkens strain function of dislocations. Experiments, MD simulations, and theoretical analysis all prove that the sources of strain broadening in X-ray diffraction of nanocrystalline materials are lattice dislocations in the GB region. The results are discussed in terms of misfit dislocations emanating in the GB regions reducing elastic strain compatibility. The results provide fundamental new insight for understanding the role of GBs in plastic deformation in both nanograin and coarse grain materials of any grain size.
Publisher: Springer Science and Business Media LLC
Date: 10-2002
Publisher: Elsevier BV
Date: 07-2016
Publisher: Office of Scientific and Technical Information (OSTI)
Date: 14-02-2017
DOI: 10.2172/1347703
Publisher: Elsevier BV
Date: 2013
Publisher: Elsevier BV
Date: 2012
Publisher: Springer Science and Business Media LLC
Date: 07-07-2011
Publisher: Laser Institute of America
Date: 2007
DOI: 10.2351/1.5061038
Publisher: Informa UK Limited
Date: 08-2011
Publisher: Elsevier BV
Date: 03-2017
Publisher: Elsevier BV
Date: 10-2019
Publisher: Trans Tech Publications, Ltd.
Date: 08-2007
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.7-8.173
Abstract: Work has been carried out recently, which demonstrates misorientation measurements recorded by using electron backscatter diffraction (EBSD) enables one to undertake local post mortem plastic strain quantification once the degree of misorientation is calibrated against plastic strain. The present paper builds on this work and investigates the possibility of determining strain in in idual grains. Due to the anisotropy of crystalline grains, polycrystalline material deform inhomogeneously on a microstructural level. In this study, the local strain induced in a pure copper specimen during tensile loading measured using EBSD was compared to in-situ strain measurements using optical microscopy imaging in conjunction with image correlation technique. By applying an averaging procedure for improving the accuracy of the measured EBSD data, the distribution of the misorientation within grains was quantified, and, as one would expect, it tended to be highest near the grain boundaries.
Publisher: Informa UK Limited
Date: 11-2012
Publisher: Elsevier BV
Date: 03-2019
Publisher: Elsevier BV
Date: 05-2016
Publisher: Elsevier BV
Date: 08-2019
Publisher: Elsevier BV
Date: 06-2016
Location: United Kingdom of Great Britain and Northern Ireland
Start Date: 11-2022
End Date: 12-2023
Amount: $851,607.00
Funder: Australian Research Council
View Funded ActivityStart Date: 12-2022
End Date: 04-2024
Amount: $2,020,000.00
Funder: Australian Research Council
View Funded Activity