报告题目(中文)：原子尺度的变形行为
报告题目(英文)：An atomic-level perspective of deformation behaviour
报告内容简介：The structural disorder of metallic glasses (MGs) entails the absence of structural features such as grain and phase boundaries, dislocations, and stacking faults. Because of this, MGs can reach yield strengths close to the theoretical limit and large elastic strains. However, the structure-property relationships are experimentally challenging to investigate because of the amorphous nature of MGs and the spatial and temporal scales of the deformation processes. The currently accessible sample sizes and timescales of molecular dynamics (MD) simulations are ideal for studying the atomic structure and deformation behaviour of MGs. In this talk I will provide an overview focused exclusively on importance of MD simulations in the investigation of structure-property relationships in metallic glasses. First, I will present a novel atomic-scale mechanism underlying shear band formation in MGs. After, valuable insights about the interplay of extrinsic size effects and plastic behavior of nanoscaled MGs will be provided. Finally, the observed enhanced plasticity in composite MGs with crystalline heterogeneities will be elucidated and the correlation between crystalline inclusions volume fraction, phase or forms and the variation in the deformation mechanisms will be investigated.
报告人姓名：Daniel Sopu
报告人简介(中文)：Dr. Daniel Sopu worked on MD simulations in the group of Prof. K. Albe at TU Darmstadt, Germany, where he received his PhD in 2011. During his PhD study, he have investigated the structure and properties of nanoscaled metallic glasses (nanoglasses) working in close collaboration with Prof. H. Gleiter and Prof. H. Hahn from the Karlsruhe Institute of Technology. Later, he held a postdoctoral position at the Interdisciplinary Centre for Advanced Materials Simulation (ICAMS) in Bochum, Germany, where he developed and optimized a transition path sampling method to determine two of the key quantities in solidification, the solid-liquid interface energy and velocity. In 2014, he joined the group of Prof. J. Eckert at IFW Dresden in Germany, and he was responsible with modeling and simulation approaches necessary to support the experimental results. In 2017, he moved to Leoben, Austria and joined the Erich Schmid Institute (ESI) of Materials Science. Now he is the leader of the atomistic modeling group.
报告人单位(中文)：奥地利科学院埃里克.施密特材料科学研究所
报告人单位(英文)：Erich Schmid Institute of Materials Science, Austrian Academy of Sciences
报告时间：2019-09-29 10:00
报告地点：宝山校区东区材料楼520会议室
主办单位：上海大学材料学院
联系人：王刚
联系方式：021－66135269
