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Featured researches published by E. W. Lui.


IOP Conference Series: Materials Science and Engineering | 2017

Processing and characterization of Al-Al3Nb prepared by mechanical alloying and equal channel angular pressing

P Chandran; A. Zafari; E. W. Lui; Kenong Xia

Mechanically alloyed Al with immiscible elements such as Nb can lead to a uniform distribution of nanoscaled precipitates which are highly stable compared to conventional alloying and with excellent interface, resulting in significant increase in strength without problems associated with nano ceramic particles in metal matrix composites. Although immiscible, Nb can be alloyed with Al through mechanical milling, forming trialuminide (Al3Nb), either directly or upon subsequent precipitation, which possesses high strength, stiffness and stability at elevated temperatures. In the present study, Al-5 at.% Nb supersaturated solid solution was achieved after prolonged ball milling and nano Al3Nb precipitates were formed during subsequent ageing at 530°C. The Al-Al3Nb powder was consolidated by equal channel angular pressing (ECAP) at 400°C, resulting in a fully dense material with a uniform distribution of nanoscaled Al3Nb precipitates in the Al matrix.


Journal of Materials Science | 2014

Multiscale composition modulated Ti–Al composite processed by severe plastic deformation

Xavier Sauvage; E. W. Lui; Kenong Xia

AbstractUsing severe plastic deformation processes to consolidate and co-deform powder mixtures to make ultrafine grain composites is a very attractive approach because it offers an almost non-limited room for combinations of phases and composite structures. The aim of this work was to investigate the mechanisms operating at different length scales and leading to multiscale structures, namely co-deformation, fragmentation and mechanical mixing. A Ti–Al composite was processed from a Ti–Al powder mixture prepared by ball milling and subsequently deformed by equal channel angular pressing. Microstructures were characterized at all length scales, down to the nanometre, using optical microscopy, scanning electron microscopy and transmission electron microscopy. It was found that the final structure exhibits unique features at various length scales. Chemical heterogeneities at the micron scale are the result of co-deformation, while at the sub-micron scale they result from the fragmentation and necking of the Ti hard phase. Then, at the nanometer scale, intermixing occurred and nanoscaled intermetallic particles were discovered. This work highlights the possibilities offered by all these mechanisms to design ultrafine grain composite structures for optimized properties.


Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science | 2017

Oxide Dissolution and Oxygen Diffusion in Solid-State Recycled Ti-6Al-4V: Numerical Modeling, Verification by Nanoindentation, and Effects on Grain Growth and Recrystallization

E. W. Lui; S. Palanisamy; Matthew S. Dargusch; Kenong Xia

AbstractThe oxide dissolution and oxygen diffusion during annealing of Ti-6Al-4V solid-state recycled from machining chips by equal-channel angular pressing (ECAP) have been investigated using nanoindentation and numerical modeling. The hardness profile from nanoindentation was converted into the oxygen concentration distribution using the Fleisher and Friedel model. An iterative fitting method was then employed to revise the ideal model proposed previously, leading to correct predictions of the oxide dissolution times and oxygen concentration profiles and verifying nanoindentation as an effective method to measure local oxygen concentrations. Recrystallization started at the prior oxide boundaries where local strains were high from the severe plastic deformation incurred in the ECAP recycling process, forming a band of ultrafine grains whose growth was retarded by solute dragging thanks to high oxygen concentrations. The recrystallized fine-grained region would advance with time to eventually replace the lamellar structure formed during ECAP.


Materials Science Forum | 2010

Nanostructured Dual Phase Ti-Al through Consolidation of Particles by Severe Plastic Deformation

E. W. Lui; W. Xu; Kenong Xia

A two-phase Ti-Al material was fabricated by severe plastic deformation. Particles of finely mixed elemental Ti and Al were mechanically milled and then consolidated by equal channel angular pressing. The bulk material has a unique interpenetrating structure of Ti and Al phases with multiple scales from micro to nano. Compared to its coarse structured counterpart, the multiscale structured material exhibited a significant increase in strength without compromising plasticity.


Acta Materialia | 2017

In situ tailoring microstructure in additively manufactured Ti-6Al-4V for superior mechanical performance

W. Xu; E. W. Lui; A. Pateras; M. Qian; Milan Brandt


Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science | 2014

Achieving Superior Strength and Ductility in Ti-6Al-4V Recycled from Machining Chips by Equal Channel Angular Pressing

D.T. McDonald; E. W. Lui; S. Palanisamy; Matthew S. Dargusch; Kenong Xia


Journal of Materials Processing Technology | 2016

Effects of chip conditions on the solid state recycling of Ti-6Al-4V machining chips

E. W. Lui; S. Palanisamy; Matthew S. Dargusch; Kenong Xia


Scripta Materialia | 2011

Multiscale two-phase Ti–Al with high strength and plasticity through consolidation of particles by severe plastic deformation

E. W. Lui; W. Xu; X. Wu; Kenong Xia


JOM | 2017

New Development in Selective Laser Melting of Ti–6Al–4V: A Wider Processing Window for the Achievement of Fully Lamellar α + β Microstructures

E. W. Lui; W. Xu; A. Pateras; M. Qian; Milan Brandt


International Journal of Powder Metallurgy | 2014

Nanostructured multi-phase titanium-based particulate composites consolidated by severe plastic deformation

W. Xu; Xiaolin Wu; Xianshun Wei; E. W. Lui; Kenong Xia

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Kenong Xia

University of Melbourne

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W. Xu

University of Melbourne

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S. Palanisamy

Swinburne University of Technology

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Andrew Ooi

University of Melbourne

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