时间：2023年6月1日（周四）14:00-15:30 

Time：2:00-3:30 PM, Thursday, Jun 1, 2023

地点：西湖大学云谷校区E10-201阶梯教室

Venue: E10-201, Yungu Campus

主持人：西湖大学理学院PI刘仕

Host: Shi Liu, PI of School of Life Sciences, Westlake University

主讲人/Speaker：

David Srolovitz is the author of ~525 research papers on materials theory/simulations of defects, microstructure, deformation, and film growth and has an h-index of ~105 and garnered ~40,000 citations.  He is a Member of the US National Academy of Engineering, Fellow of MRS, TMS, ASM, Institute of Physics and is the winner of the MRS Materials Theory Award.  He currently holds the Chair in Materials Theory and is Dean of Engineering at the University of Hong Kong. Previously, he was professor at Princeton University, the University of Pennsylvania, the University of Michigan, Yeshiva University, and the City University of Hong Kong. He has held faculty positions in Materials Science, Mechanical Engineering, Aerospace Engineering, Computer Science, Physics, Applied Physics and Applied Mathematics. Srolovitz was also on the staff of Exxon Corporate Research and Los Alamos National Laboratory and was the Executive Director of the Institute for High Performance Computing in Singapore.  His current research interests focus on the structure, thermodynamics and properties of defects in materials, the effects of these defects on mechanical deformation, electronic/optical properties, and radiation damage. He also develops new techniques for first-principles, atomistic and statistical mechanics simulations of engineering, two-dimensional, and topological materials.

报告题目/Title: 

A General Approach to Interfaces in Crystalline Solids: precipitate morphology, microstructure evolution, and dislocation-interactions

讲座摘要/Abstract: 

Since single crystals are rare, interfaces are inherent features of almost all natural and engineering materials. Their behavior determine a wide range of material properties. This includes both homo-phase (grain boundaries) and hetero-phase (multiphase materials). Most interface properties are, unsurprisingly, related to their structure. I will first present a general description of interfaces and their defects-based on some simple crystallographic ideas. The most important interface defects are disconnections; line defects with both dislocation and step character. Next, I will use these ideas to generalize the famous Frank-Bilby equation, to predict orientation-relations between matrixes and precipitates; i.e., relative orientations of two crystalline phases and interface orientations. I will then describe how to go from a disconnection picture of interface migration to continuum descriptions of microstructure evolution (interface facetting, precipitate morphology evolution, grain growth). Finally, I will analyze how dislocations in bulk phases interact with interfaces including dislocation blocking (Hall-Petch behavior), absorption, reflection, transmission and interface sliding. Comparison with experimental observations will be made throughout.

讲座联系人/Contact:

科技合作部Sci-tech02@westlake.edu.cn