报告题目：Characterization of Serrated Flows in Bulk Metallic Glasses and High Entropy Alloys
主讲人：Peter K. Liaw（教授）
Bulk metallic glasses (BMGs) and high entropy alloys (HEAs) attract more and more attention for their unique mechanical properties. Recent work suggests that BMGs and HEAs show serrated flows at certain temperatures and strain rates, which is similar to the Portevin–Le Chatelier effect (PLC) in traditional alloys. Therefore, the study of serration behavior could provide a unique way to investigate the deformation dynamics of BMGs and HEAs, and, consequently, to provide us the fundamental understanding of deformation mechanisms for BMGs and HEAs. In this study, compressive behavior of BMGs and HEAs are characterized statistically, and a new model developed from the mean field theory is utilized to describe the serrated flow in BMGs and HEAs.
Prof.Peter K. Liaw graduated from the National Tsing Hua University (Taiwan) and obtained his Ph.D. in Northwestern University, USA, in 1980. After working at the Westinghouse Research and Development (R&D) Center for thirteen years, he joins the faculty and becomes an Endowed Ivan Racheff Chair of Excellence in the Department of Materials Science and Engineering at The University of Tennessee (UT), Knoxville, since 1993. His research interests include mechanical behavior, nondestructive evaluation, biomaterials, high-temperature alloys, bulk metallic glasses, high-entropy alloys, ceramic-matrix composites and coatings with the kindest and greatest help of his colleagues at UT and the near-by Oak Ridge National Laboratory. He has published seven hundred and eighty-six journal papers, edited more than thirty books, and presented numerous keynote and invited lectures at various national and international conferences, universities, and industries.He was the Chairman of the TMS (The Minerals, Metals and Materials Society) "Mechanical Metallurgy" Committee, and the Chairman of the ASM (American Society for Metals) "Flow and Fracture" Committee. He has been the Chairman and Member of the TMS Award Committee on "Application to Practice, Educator, and Leadership Awards." He is a fellow of ASM. He has been the Director of the National Science Foundation (NSF) Integrative Graduate Education and Research Training (IGERT) Program, the Director of the NSF International Materials Institutes (IMI) Program, and the Director of the NSF Major Research Instrumentation (MRI) Program at UT.