ORCID Profile
0000-0002-9795-2168
Current Organisation
Monash University
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
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.
Additive manufacturing | Manufacturing engineering | Metals and alloy materials | Aerospace structures | Aerospace materials | Mechanical engineering | Manufacturing Processes and Technologies (excl. Textiles) | Materials Engineering | Metals and Alloy Materials | Solid mechanics | Numerical modelling and mechanical characterisation
Publisher: Springer Science and Business Media LLC
Date: 27-06-2022
Publisher: Elsevier BV
Date: 03-2023
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 03-2023
Publisher: Elsevier BV
Date: 02-2005
Publisher: Elsevier BV
Date: 2013
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 02-2022
Publisher: Elsevier BV
Date: 04-2022
Publisher: Elsevier BV
Date: 08-2021
Publisher: Springer Science and Business Media LLC
Date: 26-09-2007
Publisher: Elsevier BV
Date: 06-2023
Publisher: Elsevier BV
Date: 09-2003
Publisher: Springer Science and Business Media LLC
Date: 04-01-2021
Publisher: Elsevier BV
Date: 02-2023
Publisher: Springer Science and Business Media LLC
Date: 15-09-2022
DOI: 10.1038/S41563-022-01359-2
Abstract: Titanium alloys, widely used in the aerospace, automotive and energy sectors, require complex casting and thermomechanical processing to achieve the high strengths required for load-bearing applications. Here we reveal that additive manufacturing can exploit thermal cycling and rapid solidification to create ultrastrong and thermally stable titanium alloys, which may be directly implemented in service. As demonstrated in a commercial titanium alloy, after simple post-heat treatment, adequate elongation and tensile strengths over 1,600 MPa are achieved. The excellent properties are attributed to the unusual formation of dense, stable and internally twinned nanoprecipitates, which are rarely observed in traditionally processed titanium alloys. These nanotwinned precipitates are shown to originate from a high density of dislocations with a dominant screw character and formed from the additive manufacturing process. The work here paves the way to fabricate structural materials with unique microstructures and excellent properties for broad applications.
Publisher: Elsevier BV
Date: 11-2022
Publisher: Springer Science and Business Media LLC
Date: 15-01-2022
Publisher: Elsevier BV
Date: 12-2006
Publisher: Elsevier BV
Date: 12-2021
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 10-2020
Publisher: Elsevier BV
Date: 07-2022
Publisher: Elsevier BV
Date: 07-2020
Publisher: Elsevier BV
Date: 07-2006
Publisher: Elsevier BV
Date: 03-2022
Publisher: Elsevier BV
Date: 08-2021
Publisher: Elsevier BV
Date: 11-2021
Publisher: Informa UK Limited
Date: 20-10-2021
Publisher: Elsevier BV
Date: 07-2006
Publisher: Springer Science and Business Media LLC
Date: 17-01-2020
Publisher: Elsevier BV
Date: 03-2021
Publisher: Elsevier BV
Date: 12-2019
Publisher: Springer Science and Business Media LLC
Date: 24-05-2021
Publisher: Wiley
Date: 04-03-2020
DOI: 10.1111/EVE.13250
Publisher: Elsevier BV
Date: 02-2019
Publisher: Springer Science and Business Media LLC
Date: 16-02-2022
Publisher: Elsevier BV
Date: 05-2013
Publisher: Elsevier BV
Date: 07-2012
Publisher: Emerald
Date: 12-08-2019
Abstract: Selective laser melting (SLM) process is an additive manufacturing method that uses computer-aided design to fabricate complex components layer-by-layer. Surface roughness is one of the primary drawbacks of SLM process hence, the purpose of this paper is to present a parametric study and optimisation of fundamental parameters, including scan power, speed, inclined angle and layer thickness on surface roughness during selective laser melting of Hastelloy X. Parametric significance on surface finish was analysed using analysis of variance and response surface methodology. General agreement between predicted and measured values was achieved. Surface characteristics of both up-skin and down-skin with various angles were covered within the investigated range. Both experimental and statistical analysis showed that surface roughness of up-skin was primarily influenced by scan power, inclined angle and layer thickness while down-skin was more affected by the former two factors. Melt pool shape and staircase size were found to determine the up-skin surface, whereas attached particles were responsible for down-skin surface roughness. As per our understanding, this manuscript provides valuable insight into the surface quality problem of SLM, which is a very critical issue for up-grading the process for manufacturing real components. This manuscript helps promote improved knowledge and understanding of the attributes and capabilities of this rapidly evolving 3D printing technology. Moreover, it establishes usable processing window and helps obtain optimal conditions, thus offering useful information to professionals working in this field. By combining experiments with statistical analysis, both practice and theory relevant to SLM process are further developed.
Publisher: Elsevier BV
Date: 07-2022
Publisher: Elsevier BV
Date: 2022
Publisher: Elsevier BV
Date: 03-2022
Publisher: ASM International
Date: 30-06-2023
DOI: 10.31399/ASM.HB.V24A.A0006964
Abstract: This article briefly introduces the concept of creep properties of additively manufactured (AM) alloys, with a focus on the effects of the characteristic microstructure of AM alloys on creep performance. Relevant post-processing treatment also is discussed, in relation to improved creep performance based on the improvement of AM initial microstructure.
Publisher: Elsevier BV
Date: 06-2022
Publisher: Elsevier BV
Date: 2022
Publisher: The Electrochemical Society
Date: 09-2021
Publisher: MDPI AG
Date: 07-10-2021
DOI: 10.3390/MET11101593
Abstract: The unique thermal history of selective laser melting (SLM) can lead to high residual stress and a non-equilibrium state in as-fabricated titanium alloy components and hinders their extensive use. Post heat treatment, as a classical and effective way, could transform non-equilibrium α’ martensite and achieves desirable mechanical performance in SLMed Ti alloys. In this study, we aimed to establish the correlation between the microstructure and mechanical performances of SLMed Ti6Al4V (Ti-64) by using different heat treatment processes. The columnar prior β grain morphology and grain boundary α phase (GB-α) after different heat treatment processes were characterized, with their influences on the tensile property anisotropy fully investigated. Scanning electron microscope (SEM) observation of the fracture surface and its cross-sectional analysis found that the tensile properties, especially the ductility, were affected by the GB-α along the β grain boundary. Furthermore, the discontinuous ratio of GB-α was firstly proposed to quantitatively predict the anisotropic ductility in SLMed Ti-64. This study provides a step forward for achieving the mechanical property manipulation of SLMed Ti-64 parts.
Publisher: Elsevier BV
Date: 09-2007
Publisher: Wiley
Date: 12-09-2006
Publisher: Elsevier BV
Date: 04-2023
Publisher: Elsevier BV
Date: 05-2021
Publisher: Springer Science and Business Media LLC
Date: 11-03-2022
DOI: 10.1007/S10853-022-06990-7
Abstract: Laser powder bed fusion (LPBF) is an emerging additive manufacturing technique that is currently adopted by a number of industries for its ability to directly fabricate complex near-net-shaped components with minimal material wastage. Two major limitations of LPBF, however, are that the process inherently produces components containing some amount of porosity and that fabricated components tend to suffer from poor repeatability. While recent advances have allowed the porosity level to be reduced to a minimum, consistent porosity-free fabrication remains elusive. Therefore, it is important to understand how porosity affects mechanical properties in alloys fabricated this way in order to inform the safe design and application of components. To this aim, this article will review recent literature on the effects of porosity on tensile properties, fatigue life, impact and fracture toughness, creep response, and wear behavior. As the number of alloys that can be fabricated by this technology continues to grow, this overview will mainly focus on four alloys that are commonly fabricated by LPBF—Ti-6Al-4 V, Inconel 718, AISI 316L, and AlSi10Mg.
Publisher: Elsevier BV
Date: 03-2007
Publisher: Elsevier BV
Date: 11-2020
Publisher: Springer Science and Business Media LLC
Date: 17-08-2022
DOI: 10.1038/S41529-022-00276-8
Abstract: This study investigates the effect of microstructure on short-term and long-term oxidation behaviours of GH3536 superalloy fabricated by laser powder bed fusion (LPBF), in which the superalloy is isothermally oxidised at 950 °C for 6 h and 500 h in air. The LPBF s le exhibits improved oxidation resistance compared with a wrought counterpart after long-term exposure. The effect of microstructure ersity between LPBF and wrought s les on oxidation behaviour is discussed. The cellular structure produced during the LPBF process acts as a rapid diffusion path to accelerate the formation of a protective film in the initial stage, leading to an enhancement in oxidation resistance for extended exposure.
Publisher: Springer Science and Business Media LLC
Date: 04-09-2020
Publisher: Elsevier BV
Date: 07-2009
Publisher: Elsevier BV
Date: 07-2021
Publisher: Springer Science and Business Media LLC
Date: 14-05-2019
DOI: 10.1557/JMR.2019.125
Publisher: Springer Science and Business Media LLC
Date: 05-09-2014
Publisher: Springer Science and Business Media LLC
Date: 05-01-2021
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 02-2012
Publisher: Elsevier BV
Date: 11-2022
Publisher: Elsevier BV
Date: 08-2021
Publisher: Elsevier BV
Date: 03-2022
Publisher: Elsevier BV
Date: 07-2018
Publisher: Elsevier BV
Date: 12-2022
Publisher: Emerald
Date: 23-06-2020
Abstract: Limited research has attempted to reveal the different modes of the melt pool formation in additive manufacturing. This paper aims to study the mechanisms of surface roughness formation, especially on the aspect of melt pool formation which determine the surface profile and consequently significantly influence the surface roughness. In this study, the conditions under which different modes of melt pool formation (conduction mode and keyhole mode) occur for the case of as-fabricated Hastelloy X using direct metal laser solidification (DMLS) are derived and validated experimentally. Top surfaces of uni-directionally built s les under various processing conditions are cut, grinded, polished and etched to reveal their in idual melt pool morphologies. Similarly, up-skin (slope angle 90°) and down-skin (slope angle 90°) melt pool morphologies are also investigated to compare the differences. Surface tension gradients and resultant Marangoni flow, which dominate the melt flow in the melt pool, is also calculated to help better evaluate the melt pool shape forming. Two types of melt pool formation modes are dominating in DMLS: conduction mode and keyhole mode. Melt pool formed by conduction mode generally has an aspect ratio of 1:2 (depth vs width) and is in elliptical shape. Appropriate selection of scanning laser power and speed are required to maintain a low characteristic length and width ratio to prevent ballings. Melt pool formed by keyhole mode has an aspect ratio of 1:1 or less. High-energy contour promotes formation of key-hole-shaped melt pool which fills the gaps between layers and smoothens the up-skin surface roughness. Low-energy contour scan is necessary for down-skin surface to form small melt pool profiles and achieve low Ra. This paper provides valuable insight into the origins of surface quality problem of DMLS, which is a very critical issue for upgrading the process for manufacturing real components. This paper helps promote the understanding of the attributes and capabilities of this rapidly evolving three-dimensional printing technology and allow appropriate control of processing parameters for successful fabrication of components with sound surface quality.
Publisher: Elsevier BV
Date: 2009
Publisher: Elsevier BV
Date: 07-2022
Publisher: Elsevier BV
Date: 05-2023
Publisher: Elsevier BV
Date: 05-2021
Publisher: Wiley
Date: 02-05-2016
Publisher: Elsevier BV
Date: 11-2019
Publisher: Elsevier BV
Date: 2006
Publisher: Elsevier BV
Date: 03-2022
Publisher: Elsevier BV
Date: 12-2022
Publisher: Elsevier BV
Date: 2006
Publisher: Wiley
Date: 02-05-2016
Publisher: Elsevier BV
Date: 2022
Publisher: Elsevier BV
Date: 06-2019
Publisher: Elsevier BV
Date: 04-2022
Publisher: Elsevier BV
Date: 05-2009
Publisher: MDPI AG
Date: 19-12-2019
DOI: 10.3390/MA13010022
Abstract: The hot deformation behavior of a new Al–Mn–Sc alloy was investigated by hot compression conducted at temperatures from 330 to 490 °C and strain rates from 0.01 to 10 s−1. The hot deformation behavior and microstructure of the alloy were significantly affected by the deformation temperatures and strain rates. The peak flow stress decreased with increasing deformation temperatures and decreasing strain rates. According to the hot deformation behavior, the constitutive equation was established to describe the steady flow stress, and a hot processing map at 0.4 strain was obtained based on the dynamic material model and the Prasad instability standard, which can be used to evaluate the hot workability of the alloy. The developed hot processing diagram showed that the instability was more likely to occur in the higher Zener–Hollomon parameter region, and the optimal processing range was determined as 420–475 °C and 0.01–0.022 s−1, in which a stable flow and a higher power dissipation were achieved.
Publisher: MDPI AG
Date: 26-09-2022
DOI: 10.3390/MET12101607
Abstract: In addition to the common stable and metastable phases in titanium alloys, the face-centered cubic phase was recently observed under various conditions however, its formation remains largely unclarified. In this work, the effect of nonmetallic interstitial atoms O, N, C and B on the formation of the face-centered cubic phase of titanium was investigated with the density functional theory. The results indicate that the occupancy of O, N, C and B on the octahedral interstitial sites reduces the energy gap between the hexagonal-close-packed (HCP) and face-centered cubic (FCC) phases, thus assisting the formation of FCC-Ti under elevated temperature or plastic deformation. Such a gap further decreases with the increase in the interstitial content, which is consistent with the experimental observation of FCC-Ti under high interstitial content. The relative stability of the interstitial-containing HCP-Ti and FCC-Ti was studied against the physical and chemical origins, e.g., the lattice distortion and the electronic bonding. Interstitial O, N, C and B also reduce the stacking fault energy, thus further benefiting the formation of FCC-Ti.
Publisher: Elsevier BV
Date: 11-2022
Publisher: Elsevier BV
Date: 11-2022
Publisher: Elsevier BV
Date: 11-2022
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 04-2012
Publisher: Elsevier BV
Date: 08-2019
Publisher: Elsevier BV
Date: 02-2016
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 03-2006
Publisher: Elsevier BV
Date: 12-2022
Publisher: Wiley
Date: 18-02-2020
DOI: 10.1111/ANS.15747
Publisher: Elsevier BV
Date: 02-2007
Publisher: Elsevier BV
Date: 2022
Publisher: Informa UK Limited
Date: 31-07-2023
Publisher: Elsevier BV
Date: 09-2018
Publisher: Elsevier BV
Date: 05-2018
Publisher: Elsevier BV
Date: 2022
Publisher: MDPI AG
Date: 12-08-2021
DOI: 10.3390/MET11081278
Abstract: There is increasing usage of high strength Beta Ti alloy in aerospace components. However, one of the major challenges is to obtain homogeneous refined microstructures via the thermo-mechanical processing. To overcome this issue, an understanding of the hot deformation conditions effect on the microstructure, prior to and after annealing, is needed. In this work, the effect of strain levels, which is more precise than percentage of reduction, and strain rate under supra-transus deformation temperature on beta annealing are studied using a double cone s le. The Electron Backscattered Diffraction (EBSD) is used to determine the deformed microstructure and texture evolution, as well as the static recrystallized grains evolution using the ex situ annealing approach. This work provides evidence that the mechanisms of dynamic recovery and recrystallization, along with texture evolution, are affected by the deformation conditions, which in turn affected the subsequent static recrystallization during annealing. It will also be shown that high levels of strain do not necessarily lead to an increase in the rate of recrystallization. Finally, the results obtained provided several ex les of guidance in designing the TMP processes for obtaining not only a refine microstructure, but a more homogeneous beta microstructure during the beta processing of Beta Ti alloy.
Publisher: Elsevier BV
Date: 10-2021
Publisher: MDPI AG
Date: 16-06-2022
DOI: 10.3390/MET12061018
Abstract: Ti-23Nb-0.7Ta-(0, 2)Zr-(1.2, 4, 6, 10)O alloys were prepared using a non-consumable arc-melting method. The tensile property of Ti-23Nb-0.7Ta-2Zr-1.2O alloys was tested at temperatures from −196 °C to 750 °C. The influence of O and Zr contents on thermal forgeability, room-temperature hardness and tensile property at 750 °C was investigated. For Ti-23Nb-0.7Ta-2Zr-1.2O alloy, the tensile strength decreased, and the ductility increased with the temperature increase. O and Zr had a negative effect on the thermal forgeability. Room-temperature hardness and tensile strength increased with an increase in O and Zr contents due to interstitial, solid solution strengthening and second-phase strengthening. All of the alloys exhibited high ductility at 750 °C with the total elongation above 34% and reductions in area above 80%.
Publisher: Elsevier BV
Date: 02-2023
Publisher: Springer Science and Business Media LLC
Date: 02-07-2019
Publisher: Elsevier BV
Date: 12-2022
Publisher: Springer Science and Business Media LLC
Date: 09-11-2022
Publisher: Elsevier BV
Date: 03-2012
Publisher: Trans Tech Publications, Ltd.
Date: 09-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/KEM.622-623.231
Abstract: Open die hot forging has a wide industrial application on deforming ingot into billet with desired dimension and qualified internal microstructure. An ex le open die forging process of Ti-6Al-4V ingot is selected herein. A 3D FE-based numerical method was used to investigate the open die forging process with respect to the real working conditions. The simulation results were validated by the collected experimental process parameters from the forging system. Moreover, design of experiment method is adopted regarding the variation of process parameters to reveal the effects of critical factors on product deformation and quality characteristics. Results show that the process parameters including press speed, feed and reduction has significant effect on the workpiece deformation and effective strain which represents the forged billet formability and quality. Improved process parameters method is suggested with respect to the experienced benchmark based on the sensitivity analysis. Keywords: Open die forging Ti-6Al-4V alloy Sensitivity analysis Process parameter Numerical simulation
Publisher: Springer Science and Business Media LLC
Date: 05-06-2020
Publisher: Elsevier BV
Date: 09-2022
Location: China
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Start Date: 2023
End Date: 12-2025
Amount: $467,348.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2023
End Date: 12-2025
Amount: $490,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2023
End Date: 12-2023
Amount: $450,294.00
Funder: Australian Research Council
View Funded ActivityStart Date: 07-2014
End Date: 03-2018
Amount: $295,000.00
Funder: Australian Research Council
View Funded Activity