2/22 Speech

 

SpeakerDr. Yu Lung Chiu (趙裕隆博士)

OrganizationSenior Lecturer, School of Metallurgy and Materials, University of Birmingham

TopicPlasticity deformation of small crystalline samples

Date10:30 , 2018.2.22

LocationRoom 228, College of Engineering Building

Education

PhD in Materials Science, University of Hong Kong, China, 1999
BE in Metallurgy, Northeastern University, Shenyang China, 1994

Biography

Dr. Yu Lung Chiu studied Metallurgy for his BE degree at Northeastern University (Shenyang, China) and went on to study for a PhD in Materials Science at the University of Hong Kong (China). He spent a few years doing research and teaching at universities and research institutes in Hong Kong, France, Switzerland and New Zealand before his current employment at the University of Birmingham. He has broad research interests in electron microscopy and physical metallurgy.

Abstract

Mechanical property of small scale crystalline samples has been a research topic increasingly studied in the last decade or so, driven mainly by the miniaturized device development and also by the need for the improved fundamental understanding of crystalline plasticity. Nanomechanical testing in electron microscopes brings extra advantages to the study of dislocation mediated crystal plasticity in that specific region/feature of interest could be quantitatively characterised with the real-time imaging capability. This talk will summarise our recent studies on the plastic deformation behaviour of metals including titanium and magnesium alloys using pico-indenter systems on both SEM and TEM. The effect of sample size, orientation on the yield strength will be discussed based on the results obtained from micro-pillar samples of different internal structures. The real-time images of dislocation initiation observed will be discussed, together with the pitfalls that encountered on in-situ nanomechanical testing in electron microscopes.

2018-2-22-1