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Challenging questions in the study of high-entropy alloys

Author: Date:2018-11-15 Source:

Speaker: Prof. T. G. Nieh (E-mail: tnieh@utk.edu)

Affiliation: City University of Hong Kong, Hong Kong, China;

Date: Nov. 27th (Tuesday), 2018

Time: 10:00 – 11:30 AM

Contact: Prof. Zhaoping Lu (E-mail: luzp@ustb.edu.cn)

Location: 353 Main Building USTB

Abstract: In this presentation, I will first review briefly the history of the development of high entropy alloys. I will, then, discuss questions associated with each of the “four core effects” – high entropy, sluggish diffusion, lattice distortion, and cocktail effect, initially proposed by Professor Yeh. Are these effects physically real? I will raise several challenging questions the community is facing and must resolve, including even the definition of high entropy alloys. Even there is no clear answer to for each of these questions. However, it is a great opportunity for scientists like you to make significant contributions to this field.

Speaker’s short biography: Prof. T.G. Nieh received his doctoral degree from Stanford University, and is a full professor in the Department of Materials Science and Engineering, University of Tennessee, since joining in 2004. He worked previously for Lockheed-Martin and Lawrence Livermore National Laboratory. Dr. Nieh is a world leader in superplasticity and superplastic forming. He is also widely recognized for his work in several material science disciplines, including multicomponent complex alloys (including high entropy alloys and bulk metallic glasses), nanocrystalline materials, lightweight alloys, metal-matrix composites, intermetallics, refractory metals and nanolaminates. He published over 400 papers and a textbook on “Superplasticity of metals and ceramics’. He is now serving as Editor-in-Chief, Journal of Intermetallics, has served as Editor, Materials Letters, 2008-2013. He was elected as a fellow of TMS in 2004 and ASM international in 1992.