报告题目：Experimental and Computational Investigation of Microstructures and Mechanical Behavior of High-Entropy Alloys (HEAs)
主讲人：Peter K. Liaw（教授）
The creation and design of novel structural materials with enhanced mechanical behavior have always been the goal of many scientists and engineers. The high-entropy alloy (HEA) concept has revolutionized alloy-design approaches, by employing the use of multi-principal elements in contrast to traditional alloys, based on one or two principal elements with small amounts of alloying elements to achieve desired properties. HEAs are candidate materials for structural applications. The fundamental studies on the microstructures of AlxCoCrFeNi HEAs have been performed using atom probe tomography and neutron diffraction. Specifically, the deformation mechanisms of both single-phase and NiAl-strengthened HEAs have been investigated, employing in-situ neutron diffraction during tensile tests. Moreover, the lattice strains of both single-phase and NiAl-strengthened HEAs have been predicted, through an integrated approach, coupling modeling [crystal-plasticity finite-element modeling (CPFEM)] and experiments.
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.