Dr Zhao Yuan Leong
Ph.D MEng (Hons.) AMInst IMMM
Department of Materials Science and Engineering
Full contact details
Department of Materials Science and Engineering
Sir Robert Hadfield Building
Zhao is currently a research associate in the Functional Magnetic Materials group, under project PI Professor Nicola Morley.
He pursued his PhD in alloy design under the supervision of Professor Russell Goodall (available on White Rose) and was awarded the degree in 2018, receiving the Brunton medal for his thesis. His M.Eng in Materials Science & Engineering was also completed at the University of Sheffield with his master’s thesis awarded the Lucy Oldfield award (3rd place).
He enjoys the application of technology and engineering knowledge in a broader context outside his field(s), and has taken part in several such ventures, notably winning the first place for the 'Silicon Valley Comes to the UK' appathon 2013, and recently the 'Best Strategist' award for Hacktrain 2017.
Naturally curious, he is quite partial to coffee, but fundamentally enjoys tea far more.
- Research interests
Magnetostrictive sensors for composite structural health monitoring
Composites, although possessing good properties are subject to complicated modes of failure; often these damages are barely visible as they may be located between composite layers. Structural Health Monitoring (SHM) of aircraft composite is required to determine the barely visible impact damage (BVID) that occurs during flight; if caught early before the damage becomes irreparable, it can be repaired in-situ, so saving money and time.
BVID causes a strain within the composite, which can be measured using magnetostrictive ribbons. This work focuses on the development of a magnetostrictive sensor capable of detecting barely-visible-damage (BVD), essential to the usage of composites in high-performance environments such as in the aerospace industry.
Funded by the European JTI-CleanSky2 program under the Grant Agreement n◦ 314768 (SHERLOC).
Alloy design of multiple component alloys
Traditionally, alloy design has revolved around one major component with small alloying additions; new research into alloy-design has shown that a pirate’s ‘treasure trove’ of interesting properties may be found in hitherto unexplored near-equimolar multi-component alloys (typically four or more), towards the centre of phase diagrams. The different stabilised structures and microstructures resulting from alloying interactions can result in many interesting properties. Of further interest is that they may adopt the simple phases of pure elements (face-centred cubic (FCC), body centred cubic (BCC), or hexagonal close packed (HCP)) rather than the expected ordered intermetallic compounds.
Some industrially relevant examples of the use of these alloys are as possible catalysts, as radiation-resistant materials, magnetic thin films, structural materials, and hardfacing materials. With guidance from computer predictions, the alloy designer will be able to adopt strategies to discover new compositions, that may then be tested for their efficacy in different applications.
- Catalytic potential of multicomponent alloy systems, Collaborative project under the Desai Research Internship Scheme, University of Sheffield, Sheffield, U.K., 2017
- Socially Enterprising Researcher (SER) Grant: Expedited enzyme hydrolysis of soy sauce, University of Sheffield, Sheffield, U.K., 2016
- Study of dual-phase functionalisation of NiCoFeCr-Alx multicomponent alloys for the enhancement of magnetic properties and magneto-caloric effect. Materials Today Energy. View this article in WRRO
- Prediction of phase, hardness and density of high entropy alloys based on their electronic structure and average radius. Journal of Alloys and Compounds, 158799-158799.
- Dilatational strain biplots against enthalpy of mixing for predicting high-entropy alloys and complex concentrated alloys phase stability. Materials Chemistry and Physics, 262, 124241-124241.
- Magnetic properties of the complex concentrated alloy system CoFeNi0.5Cr0.5Alx. Scientific Reports, 10(1).
- Structural investigation of the stability in temperature of some high entropy / multi major components alloys as a function of their electronic structure. Journal of Alloys and Compounds, 837. View this article in WRRO
- Refining as-cast structures of novel SixTiVCrZr high-entropy alloys using estimated effective solidification temperature obtained using Chvorinov’s rule. Metals, 10(3). View this article in WRRO
- Design and development of magnetostrictive actuators and sensors for structural health monitoring. Sensors, 20(3). View this article in WRRO
- Magnetostrictive sensors for composite damage detection and wireless structural health monitoring. IEEE Transactions on Magnetics, 55(7). View this article in WRRO
- Structural dependency of some multiple principal component alloys with the Thomas-Fermi-Dirac electron density. Scripta Materialia, 146, 95-99. View this article in WRRO
- Artificial multiferroic structures using soft magnetostrictive bilayers on Pb(Mg1/3Nb2/3)–PbTiO3. Journal of Physics D: Applied Physics, 51. View this article in WRRO
- Electronegativity and enthalpy of mixing biplots for High Entropy Alloy solid solution prediction. Materials Chemistry and Physics.
- The Effect of Electronic Structure on the Phases Present in High Entropy Alloys. Scientific Reports, 7. View this article in WRRO
- Structure of some CoCrFeNi and CoCrFeNiPd multicomponent HEA alloys by diffraction techniques. Journal of Alloys and Compounds, 681, 330-341. View this article in WRRO
- Structure and Properties of Some CoCrFeNi-Based High Entropy Alloys, TMS2015 Supplemental Proceedings (pp. 1147-1155). John Wiley & Sons, Inc.
Conference proceedings papers
- Combined Atom Probe Tomography and TEM Investigations of CoCrFeNi, CoCrFeNi-Pdx(x=0.5, 1.0, 1.5) and CoCrFeNi-Sn. Acta Physica Polonica A, Vol. 128(4) (pp 557-561)
- Crystalline Structures of Some High Entropy Alloys Obtained by Neutron and X-Ray Diffraction. Acta Physica Polonica A, Vol. 128(4) (pp 552-557)
- Structure and Properties of Some CoCrFeNi-Based High Entropy Alloys (pp 1147-1155)
- Professional activities
Editor-in-Chief, Committee member, University of Sheffield Engineering Symposium (USES) conference proceedings, University of Sheffield, Sheffield, U.K., 2014-2015