ORCID Profile
0000-0003-3612-8762
Current Organisation
Deakin University
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Nanoscale Characterisation | Nanoscale characterisation | Materials engineering | Reaction kinetics and dynamics | Condensed Matter Physics | Nanotechnology | Materials Engineering | Metals and Alloy Materials | Biomedical Engineering not elsewhere classified | Condensed Matter Imaging | Condensed Matter Characterisation Technique Development | Functional materials |
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in Technology | Basic Iron and Steel Products | Expanding Knowledge in the Chemical Sciences | Expanding Knowledge in the Physical Sciences | Expanding Knowledge in Engineering | Environmentally Sustainable Manufacturing not elsewhere classified | Health Protection and/or Disaster Response
Related Links
Publications
Combined atom probe tomography and density functional theory investigation of the Al off-stoichiometry of κ-carbides in an austenitic Fe–Mn–Al–C low density steel
Publisher: Elsevier BV
Date: 03-2016
A systematic study on the influence of electrochemical charging conditions on the hydrogen embrittlement behaviour of a pipeline steel
Publisher: Elsevier BV
Date: 05-2023
Formation of eta carbide in ferrous martensite by room temperature aging
Publisher: Elsevier BV
Date: 10-2018
Atom Probe Tomography Study of the Nanoscale Heterostructure around an Al20Mn3Cu2 Dispersoid in Aluminum Alloy 2024
Publisher: American Chemical Society (ACS)
Date: 02-12-2014
DOI: 10.1021/LA503418U
Abstract: Atom probe tomography (APT) has been used to investigate the surface and sub-surface microstructures of aluminum alloy 2024 (AA2024) in the T3 condition (solution heat treated, cold worked, and naturally aged to a substantially stable condition). This study revealed surface Cu enrichment on the alloy matrix, local chemical structure around a dispersoid Al20Mn3Cu2 particle including a Cu-rich particle and S-phase particle on its external surface. Moreover, there was a significant level of hydrogen within the dispersoid, indicating that it is a hydrogen sink. These observations of the nanoscale structure around the dispersoid particle have considerable implications for understanding both corrosion and hydrogen embrittlement in high-strength aluminum alloys.
The effect of molybdenum on interphase precipitation at 700 °C in a strip-cast low-carbon niobium steel
Publisher: Elsevier BV
Date: 08-2020
New developments in the characterization of dislocation loops from LACBED patterns
Publisher: Wiley
Date: 09-2006
DOI: 10.1111/J.1365-2818.2006.01631.X
Abstract: The characterization of the Burgers vector of dislocations from large-angle convergent-beam electron diffraction (LACBED) patterns is now a well-established method. The method has already been applied to relatively large and isolated dislocation loops in semiconductors. Nevertheless, some severe experimental difficulties are encountered with small dislocation loops. By using a 2 microm selected-area aperture and a carbon contamination point to mark the loop of interest, we were able to characterize both the plane and the Burgers vector of dislocation loops of a few tens of nanometres in size present in Al-Cu-Mg alloys.
Atom probe tomography investigation of heterogeneous short-range ordering in the 'komplex' phase state (K-state) of Fe-18Al (at.%)
Publisher: Elsevier BV
Date: 09-2015
Direct ageing experiments on nanometre-scale aluminium alloy samples
Publisher: Elsevier BV
Date: 06-2022
Near-Atomic Three-Dimensional Mapping for Site-Specific Chemistry of ‘Superbugs’
Publisher: American Chemical Society (ACS)
Date: 14-10-2016
Understanding the Effects of Graphene Coating on the Electrostatic Field at the Tip of an Atom Probe Tomography Specimen
Publisher: Oxford University Press (OUP)
Date: 08-2021
DOI: 10.1017/S1431927621012356
Abstract: As a three-dimensional characterization method, atom probe tomography can provide key information that other methods cannot offer. Conductive coatings have proved to be an effective way for biological s les, and nonconductive s les in general, to be analyzed using voltage-pulsed atom probe tomography. In this study, we analyzed the effects of graphene coating on an electrically conductive material and were able to confirm the detection of carbon atoms. We compare quantitative electrostatic field metrics for a single-coated and a multi-coated specimen and measure both a reduced voltage after graphene coating and lowered charge-state ratios for different ion species, suggesting a lowered evaporation field related to the graphene coating. This information will be instructive for future studies on graphene-coated, nonconductive biological specimens.
Analysis of strengthening in AA6111 during the early stages of aging: Atom probe tomography and yield stress modelling
Publisher: Elsevier BV
Date: 11-2013
A three-dimensional Markov field approach for the analysis of atomic clustering in atom probe data
Publisher: Informa UK Limited
Date: 21-04-2010
Atomically resolved tomography to directly inform simulations for structure-property relationships
Publisher: Springer Science and Business Media LLC
Date: 19-11-2014
DOI: 10.1038/NCOMMS6501
Abstract: Microscopy encompasses a wide variety of forms and scales. So too does the array of simulation techniques developed that correlate to and build upon microstructural information. Nevertheless, a true nexus between microscopy and atomistic simulations is lacking. Atom probe has emerged as a potential means of achieving this goal. Atom probe generates three-dimensional atomistic images in a format almost identical to many atomistic simulations. However, this data is imperfect, preventing input into computational algorithms to predict material properties. Here we describe a methodology to overcome these limitations, based on a hybrid data format, blending atom probe and predictive Monte Carlo simulations. We create atomically complete and lattice-bound models of material specimens. This hybrid data can then be used as direct input into density functional theory simulations to calculate local energetics and elastic properties. This research demonstrates the role that atom probe combined with theoretical approaches can play in modern materials engineering.
Simultaneously increasing the hydrophobicity and interfacial adhesion of carbon fibres: a simple pathway to install passive functionality into composites
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA02436K
Abstract: Hydrophobic carbon fibres were developed and show improved interfacial adhesion.
Solute clustering in Al–Cu–Mg alloys during the early stages of elevated temperature ageing
Publisher: Elsevier BV
Date: 09-2010
Impact of nanodiffusion on the stacking fault energy in high-strength steels
Publisher: Elsevier BV
Date: 08-2014
Revealing the Strain-Hardening Mechanisms of Advanced High-Mn Steels by Multi-Scale Microstructure Characterization
Publisher: Trans Tech Publications, Ltd.
Date: 23-05-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.783-786.755
Abstract: We have investigated the strain-hardening mechanisms across the relevant scales in a Fe-22Mn-0.6C (wt.%) twinning induced plasticity steel by multi-scale microstructure characterization. The approach makes use of electron microscopy techniques such as electron channeling contrast imaging (ECCI) to characterize microstructure features at the micro/nanoscale, and atomic-scale investigations of partitioning behavior across interfaces and solid solution/clustering effects by atom probe tomography (APT). The contribution of most relevant microstructure features to strain hardening is analyzed.
Composition dependent thermal stability and evolution of solute clusters in Al-Mg-Si analyzed using atom probe tomography
Publisher: Elsevier BV
Date: 04-2018
Dynamic reconstruction for atom probe tomography
Publisher: Elsevier BV
Date: 11-2011
DOI: 10.1016/J.ULTRAMIC.2011.08.005
Abstract: Progress in the reconstruction for atom probe tomography has been limited since the first implementation of the protocol proposed by Bas et al. in 1995. This approach and those subsequently developed assume that the geometric parameters used to build the three-dimensional atom map are constant over the course of an analysis. Here, we test this assumption within the analyses of low-alloyed materials. By building upon methods recently proposed to measure the tomographic reconstruction parameters, we demonstrate that this assumption can introduce significant limitations in the accuracy of the analysis. Moreover, we propose a strategy to alleviate this problem through the implementation of a new reconstruction algorithm that dynamically accommodates variations in the tomographic reconstruction parameters.
Graphene-Enhanced 3D Chemical Mapping of Biological Specimens at Near-Atomic Resolution
Publisher: Wiley
Date: 20-06-2018
Role of nanostructure in pitting of Al-Cu-Mg alloys
Publisher: Elsevier BV
Date: 11-2010
Grain boundary segregation in Fe–Mn–C twinning-induced plasticity steels studied by correlative electron backscatter diffraction and atom probe tomography
Publisher: Elsevier BV
Date: 2015
Quantitative atom probe analysis of nanostructure containing clusters and precipitates with multiple length scales
Publisher: Elsevier BV
Date: 05-2011
DOI: 10.1016/J.ULTRAMIC.2010.12.029
Abstract: A model Al-3 Cu-(0.05 Sn) (wt%) alloy containing a bimodal distribution of relatively shear-resistant θ' precipitates and shearable GP zones is considered in this study. It has recently been shown that the addition of the GP zones to such microstructures can lead to significant increases in strength without a decrease in the uniform elongation. In this study, atom probe tomography (APT) has been used to quantitatively characterise the evolution of the GP zones and the solute distribution in the bimodal microstructure as a function of applied plastic strain. Recent nuclear magnetic resonance (NMR) analysis has clearly shown strain-induced dissolution of the GP zones, which is supported by the current APT data with additional spatial information. There is significant repartitioning of Cu from the GP zones into the solid solution during deformation. A new approach for cluster finding in APT data has been used to quantitatively characterise the evolution of the sizes and shapes of the Cu containing features in the solid solution solute as a function of applied strain.
Site-specific atomic-scale characterisation of retained austenite in a strip cast TRIP steel
Publisher: Elsevier BV
Date: 08-2017
Preparation of site specific atom probe tips using focused ion beam technology
Publisher: Oxford University Press (OUP)
Date: 31-07-2006
DOI: 10.1017/S1431927606062866
Abstract: Extended abstract of a paper presented at Microscopy and Microanalysis 2006 in Chicago, Illinois, USA, July 30 – August 3, 2006
LACBED characterization of dislocation loops
Publisher: Informa UK Limited
Date: 11-10-2006
Microstructural evolution of spinodally formed Fe35 Ni15 Mn25 Al25
Publisher: Elsevier BV
Date: 11-2009
Influence of solute effects on the saturation grain size and rate sensitivity in Cu-X alloys
Publisher: Elsevier BV
Date: 02-2018
Evolution of solute clustering in Al-Cu-Mg alloys during secondary ageing
Publisher: Elsevier BV
Date: 03-2010
Vanadium microalloying for ultra-high strength steel sheet treated by hot-dip metallising
Publisher: Informa UK Limited
Date: 04-10-2016
Understanding the detection of carbon in austenitic high-Mn steel using atom probe tomography
Publisher: Elsevier BV
Date: 09-2013
DOI: 10.1016/J.ULTRAMIC.2013.01.010
Abstract: A high-Mn TWIP steel having composition Fe-22Mn-0.6C (wt%) is considered in this study, where the need for accurate and quantitative analysis of clustering and short-range ordering by atom probe analysis requires a better understanding of the detection of carbon in this system. Experimental measurements reveal that a high percentage of carbon atoms are detected as molecular ion species and on multiple hit events, which is discussed with respect to issues such as optimal experimental parameters, correlated field evaporation and directional walk/migration of carbon atoms at the surface of the specimen tip during analysis. These phenomena impact the compositional and spatial accuracy of the atom probe measurement and thus require careful consideration for further cluster-finding analysis.
Atom probe tomography at the University of Sydney
Publisher: Springer Berlin Heidelberg
Date: 2008
A lightweight single-phase AlTiVCr compositionally complex alloy
Publisher: Elsevier BV
Date: 2017
Graphene encapsulation enabled high-throughput atom probe tomography of liquid specimens
Publisher: Elsevier BV
Date: 09-2020
Fundamentals of aluminium metallurgy
Publisher: Woodhead Publishing Limited
Date: 2011
Communication: Solute diffusion characteristics of a rapid hardening Al-Cu-Mg alloy during the early stages of age hardening
Publisher: Springer Science and Business Media LLC
Date: 26-05-2010
Short-range order in multicomponent materials
Publisher: International Union of Crystallography (IUCr)
Date: 20-07-2012
Ion-Induced Bending with Applications for High-Resolution Electron Imaging of Nanometer-Sized Samples
Publisher: American Chemical Society (ACS)
Date: 02-11-2021
The effect of molybdenum on clustering and precipitation behaviour of strip-cast steels containing niobium
Publisher: Elsevier BV
Date: 12-2019
Atom Probe Tomography of Aluminium Alloys: A Systematic Meta-Analysis Review of 2018
Publisher: MDPI AG
Date: 10-2019
DOI: 10.3390/MET9101071
Abstract: Atom probe tomography (APT) is a microscopy technique that provides a unique combination of information, specifically the position and elemental identity of each atom in three dimensions. Although the mass and spatial resolution is not perfect, we are still able to gain insights into materials science questions that we cannot access using other techniques. This systematic meta-analysis review summarises research in 2018 that used APT to study materials science questions in aluminium alloys.
Lattice Rectification in Atom Probe Tomography: Toward True Three-Dimensional Atomic Microscopy
Publisher: Oxford University Press (OUP)
Date: 08-03-2011
DOI: 10.1017/S1431927610094535
Abstract: Atom probe tomography (APT) represents a significant step toward atomic resolution microscopy, analytically imaging in idual atoms with highly accurate, though imperfect, chemical identity and three-dimensional (3D) positional information. Here, a technique to retrieve crystallographic information from raw APT data and restore the lattice-specific atomic configuration of the original specimen is presented. This lattice rectification technique has been applied to a pure metal, W, and then to the analysis of a multicomponent Al alloy. Significantly, the atoms are located to their true lattice sites not by an averaging, but by triangulation of each particular atom detected in the 3D atom-by-atom reconstruction. Lattice rectification of raw APT reconstruction provides unprecedented detail as to the fundamental solute hierarchy of the solid solution. Atomic clustering has been recognized as important in affecting alloy behavior, such as for the Al-1.1Cu-1.7Mg (at. %) investigated here, which exhibits a remarkable rapid hardening reaction during the early stages of aging, linked to clustering of solutes. The technique has enabled lattice-site and species-specific radial distribution functions, nearest-neighbor analyses, and short-range order parameters, and we demonstrate a characterization of solute-clustering with unmatched sensitivity and precision.
Precipitation processes in Al-Cu-Mg-Sn and Al-Cu-Mg-Sn-Ag
Publisher: Elsevier BV
Date: 04-2016
G phase precipitation and strengthening in ultra-high strength ferritic steels: Towards lean ‘maraging’ metallurgy
Publisher: Elsevier BV
Date: 05-2017
A study of the composition dependence of the rapid hardening phenomenon in Al-Cu-Mg alloys using diffusion couples
Publisher: Elsevier BV
Date: 06-2012
Precipitation and solute clustering in aluminium: Advanced characterisation techniques
Publisher: Elsevier
Date: 2010
Nanostructure of aluminium alloy 2024: Segregation, clustering and precipitation processes
Publisher: Elsevier BV
Date: 02-2011
The competition between metastable and equilibrium S (Al2 CuMg) phase during the decomposition of AlCuMg alloys
Publisher: Elsevier BV
Date: 10-2015
Influence of coiling on microstructural evolution and mechanical properties of strip-cast low-carbon low-niobium steel
Publisher: Trans Tech Publications, Ltd.
Date: 15-11-2017
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.879.1182
Abstract: As-cast low-carbon low-niobium steels fabricated by direct strip casting (DSC) were treated by simulated coiling in the lab. Coiling temperatures were carefully selected: (1) 900 ̊C (in the austenite) (2) 700 ̊C (during the austenite-to-ferrite transformation) (3) 650 ̊C (in the ferrite). Optical microscopy and transmission electron microscopy were used to examine the microstructure constituents and the precipitates. Mechanical properties were evaluated by Vickers macrohardness measurements. The results show that coiling treatment has a strong influence on the final microstructure and mechanical properties, thus highlighting the necessity to carefully design the coiling treatment. In addition, the differences in hardness for the three coiling temperatures derive from a complex combination of different strengthening mechanisms.
Multi-Scale Correlative Microscopy Investigation of Both Structure and Chemistry of Deformation Twin Bundles in Fe–Mn–C Steel
Publisher: Oxford University Press (OUP)
Date: 08-10-2013
DOI: 10.1017/S1431927613013494
Abstract: A multi-scale investigation of twin bundles in Fe–22Mn–0.6C (wt%) twinning-induced plasticity steel after tensile deformation has been carried out by truly correlative means using electron channelling contrast imaging combined with electron backscatter diffraction, high-resolution secondary ion mass spectrometry, scanning transmission electron microscopy, and atom probe tomography on the exact same region of interest in the s le. It was revealed that there was no significant segregation of Mn or C to the twin boundary interfaces.
Atom probe tomography data analysis procedure for precipitate and cluster identification in a Ti-Mo steel
Publisher: Elsevier BV
Date: 06-2018
Precipitation strengthening of aluminum alloys by room-temperature cyclic plasticity
Publisher: American Association for the Advancement of Science (AAAS)
Date: 03-2019
Abstract: High-strength aluminum alloys are important for producing lightweight cars, trains, and airplanes. The traditional strategy for doing this is through hours of high-temperature cycling to form precipitates in the alloy. Sun et al. developed a processing method that relies on mechanical cycling by pushing and pulling on the alloys at room temperature. This quickly creates many very fine precipitates that have the same strengthening effect as those characteristic of traditional thermal methods. This method should also work for other alloy systems. Science , this issue p. 972
Analysis of dynamic segregation and crystallisation in Mg 65 Cu 25 Y 10 bulk metallic glass using atom probe tomography
Publisher: Elsevier BV
Date: 10-2012
Probing corrosion initiation at interfacial nanostructures of AA2024-T3
Publisher: Elsevier BV
Date: 02-2017
Methods of Preparing Nanoscale Vitreous Ice Needles for High-Resolution Cryogenic Characterization
Publisher: American Chemical Society (ACS)
Date: 04-08-2022
DOI: 10.1021/ACS.NANOLETT.2C01495
Abstract: New high-resolution imaging methods for biological s les such as atom probe tomography (APT), facilitated by the invention of laser-pulsed atom probes and cryo-transfer procedures, have recently emerged. However, ensuring the vitreous state of the fabricated aqueous needle-shaped APT s les remains a challenge despite it being crucial for characterizing biomolecules such as proteins and cellular architectures in their near-native state. Our work investigated three potential approaches: (1) open microcapillary (OMC) method, (2) high-pressure freezing method (HPF), and (3) graphene encapsulation method. Diffraction patterns of the needle specimens acquired by cryo-TEM have demonstrated the vitreous state of the ice needles, although limited to the tip regions, has been achieved with the three proposed approaches. With the capability to prepare vitreous ice needles from hydrated s les of up to ∼200 μm thickness (HPF), combined use of the three approaches opens new avenues for future near-atomic imaging of biological cells in their near-native state.
The effect of high yttrium solute concentration on the twinning behaviour of magnesium alloys
Publisher: Elsevier BV
Date: 2015
Precipitation and clustering in a Ti-Mo steel investigated using atom probe tomography and small-angle neutron scattering
Publisher: Elsevier BV
Date: 03-2018
New Research Techniques in Aluminium Alloy Development
Publisher: Elsevier
Date: 2018
Effect of molybdenum on phase transformation and microstructural evolution of strip cast steels containing niobium
Publisher: Springer Science and Business Media LLC
Date: 14-09-2018
The Effect of Molybdenum on Precipitation Behaviour in Austenite of Strip-Cast Steels Containing Niobium
Publisher: MDPI AG
Date: 05-10-2020
DOI: 10.3390/MET10101330
Abstract: Two low-C steels microalloyed with niobium (Nb) were fabricated by simulated strip casting, one with molybdenum (Mo) and the other without Mo. Both steels were heat treated to simulate coiling at 900 °C to investigate the effect of Mo on the precipitation behaviour in austenite in low-C strip-cast Nb steels. The mechanical properties results show that during the isothermal holding at 900 °C the hardness of both steels increases and reaches a peak after 3000 s and then decreased after 10,000 s. Additionally, the hardness of the Mo-containing steel is higher than that of the Mo-free steel in all heat-treated conditions. Thermo-Calc predictions suggest that MC-type carbides exist in equilibrium at 900 °C, which are confirmed by transmission electron microscopy (TEM). TEM examination shows that precipitates are formed after 1000 s of isothermal holding in both steels and the size of the particles is refined by the addition of Mo. Energy dispersive spectroscopy (EDS) and electron energy loss spectroscopy (EELS) reveal that the carbides are enriched in Nb and N. The presence of Mo is also observed in the particles in the Nb-Mo steel during isothermal holding at 900 °C. The concentration of Mo in the precipitates decreases with increasing particle size and isothermal holding time. The precipitates in the Nb-Mo steel provide significant strengthening increments of up to 140 MPa, higher than that in the Nb steel, ~96 MPa. A thermodynamic rationale is given, which explains that the enrichment of Mo in the precipitates reduces the interfacial energy between precipitates and matrix. This is likely to lower the energy barrier for their nucleation and also reduce the coarsening rate, thus leading to finer precipitates during isothermal holding at 900 °C.
Three-Dimensional Chemical Mapping of a Single Protein in the Hydrated State with Atom Probe Tomography
Publisher: American Chemical Society (ACS)
Date: 10-03-2020
Vacancy-Solute Interactions in Al-Cu-Mg
Publisher: Trans Tech Publications Ltd.
Date: 15-07-2006
Atomic-scale analysis of light alloys using atom probe tomography
Publisher: Maney Publishing
Date: 11-02-2016
Vacancy-Solute Interactions in Al-Cu-Mg
Publisher: Trans Tech Publications, Ltd.
Date: 07-2006
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.519-521.197
Abstract: This is an initial report of a multi-technique study on the effect of Mg alloying on solute-vacancy interactions during the early stages of ageing of dilute 2xxx Al-Cu-Mg alloys so as to better understand the early rapid hardening (RH) that occurs in certain compositions of these alloys and the more general phenomena of secondary hardening (SH) at ambient temperatures. Therefore, RH at 150 °C and SH at room temperature from the as-quenched condition and after 60 sec ageing at 150 °C were studied in Al-1.1Cu and Al-1.1Cu-0.5Mg (at. %) variously by positron annihilation lifetime spectroscopy (PALS), coincidence Doppler broadening (CDB) spectroscopy and atom probe tomography (APT) and monitored by Vickers hardness measurements. The present results indicate that Cu-Cu, Mg-Mg and Cu-Mg clusters are formed in the ternary alloy already in the asquenched state and that they persist during ageing at 150 °C. The fraction of the solutes Cu and Mg that were associated with vacancies after ageing was increased 10-fold and double, respectively and the strength of the Cu clustering is enhanced greatly after 60 sec at 150 °C.
A nexus between 3D atomistic data hybrids derived from atom probe microscopy and computational materials science: A new analysis of solute clustering in Al-alloys
Publisher: Elsevier BV
Date: 04-2017
Quantitative chemical-structure evaluation using atom probe tomography: Short-range order analysis of Fe-Al
Publisher: Elsevier BV
Date: 10-2015
DOI: 10.1016/J.ULTRAMIC.2015.05.001
Abstract: Short-range-order (SRO) has been quantitatively evaluated in an Fe-18Al (at%) alloy using atom probe tomography (APT) data and by calculation of the generalised multicomponent short-range order (GM-SRO) parameters, which have been determined by shell-based analysis of the three-dimensional atomic positions. The accuracy of this method with respect to limited detector efficiency and spatial resolution is tested against simulated D03 ordered data. Whilst there is minimal adverse effect from limited atom probe instrument detector efficiency, the combination of this with imperfect spatial resolution has the effect of making the data appear more randomised. The value of lattice rectification of the experimental APT data prior to GM-SRO analysis is demonstrated through improved information sensitivity.
Pulsed-voltage atom probe tomography of low conductivity and insulator materials by application of ultrathin metallic coating on nanoscale specimen geometry
Publisher: Elsevier BV
Date: 10-2017
DOI: 10.1016/J.ULTRAMIC.2017.05.002
Abstract: We present a novel approach for analysis of low-conductivity and insulating materials with conventional pulsed-voltage atom probe tomography (APT), by incorporating an ultrathin metallic coating on focused ion beam prepared needle-shaped specimens. Finite element electrostatic simulations of coated atom probe specimens were performed, which suggest remarkable improvement in uniform voltage distribution and subsequent field evaporation of the insulated s les with a metallic coating of approximately 10nm thickness. Using design of experiment technique, an experimental investigation was performed to study physical vapor deposition coating of needle specimens with end tip radii less than 100nm. The final geometries of the coated APT specimens were characterized with high-resolution scanning electron microscopy and transmission electron microscopy, and an empirical model was proposed to determine the optimal coating thickness for a given specimen size. The optimal coating strategy was applied to APT specimens of resin embedded Au nanospheres. Results demonstrate that the optimal coating strategy allows unique pulsed-voltage atom probe analysis and 3D imaging of biological and insulated s les.
Mining information from atom probe data
Publisher: Elsevier BV
Date: 12-2015
DOI: 10.1016/J.ULTRAMIC.2015.05.006
Abstract: Whilst atom probe tomography (APT) is a powerful technique with the capacity to gather information containing hundreds of millions of atoms from a single specimen, the ability to effectively use this information creates significant challenges. The main technological bottleneck lies in handling the extremely large amounts of data on spatial-chemical correlations, as well as developing new quantitative computational foundations for image reconstruction that target critical and transformative problems in materials science. The power to explore materials at the atomic scale with the extraordinary level of sensitivity of detection offered by atom probe tomography has not been not fully harnessed due to the challenges of dealing with missing, sparse and often noisy data. Hence there is a profound need to couple the analytical tools to deal with the data challenges with the experimental issues associated with this instrument. In this paper we provide a summary of some key issues associated with the challenges, and solutions to extract or "mine" fundamental materials science information from that data.
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Deakin University - Geelong Campus At Waurn Ponds
Location: Australia
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