应我校材料科学与工程学院施海龙助理教授和王晓军教授邀请，法国洛林大学的Claude Esling教授将于2024年11月14日赴我校进行材料织构和各向异性专题讲座，讲座面向全校师生，欢迎感兴趣的老师同学到场参加。

【主讲人】：Claude Esling

【报告题目】：（1）Texture and Anisotropy of Materials；（2）Crystal-defect-associated transformation strain paths of Electric Current Pulse (ECP) induced α to β transformation in Cu-40％Zn

【时间】：2024年11月14日9:30-11:00

【地点】：材料楼521

【摘要】：In the first part, some basic concepts of polycrystalline structures, like grains and grain boundaries, pole figures, and three-dimensional texture function will be discussed. In the second part, a particular case of phase transformation and microstructure development will be examined. A systematic study was conducted on a Cu-40%Zn alloy treated by an electric current pulse (ECP), and the microstructure and crystallographic features of both the parent and the product phases were examined. The β precipitates under ECP show a Kurdjumov Sachs Orientation Relation (K-S OR) in the vicinity of the grain boundaries (GBs), but a Nishiyama Wasserman (N-W) OR within the grains. Along the GBs the {111}α /<1-1 0>α dislocation arrays were spotted, whereas the {111}α /<11-2 >α stacking faults were observed in the grain interiors. A closer examination of the lattice strain required for the phase transformation revealed that the maximum lattice deformation under the K-S OR is a shear on the {111}α plane in the <1-1 0>α direction. The dislocations arrays existing along the GBs offer the pre-strain that favors the precipitation of β particles obeying the K-S OR. Oppositely, the stacking faults within the grains provide pre-stains for the formation of the β precipitates respecting the N-W OR. This study sheds some light on the mechanisms by which crystal defects initiate phase transformation in a Cu-40%Zn alloy.

【报告人简介】：Claude Esling是法国织构与各向异性学会的联合创始人兼副会长。Claude Esling教授与Bunge教授共同创办并担任国际期刊《Textures and Microstructures》的联合主编。Claude Esling教授也是洛林大学（法国国家科学研究中心）LEM3实验室（材料织构与应用实验室）的联合创始人。Claude Esling教授曾任梅斯大学副校长，并在Applied Physics Letters 和 Acta Materialia等国际期刊上发表了300多篇学术论文。1993年，Claude Esling被东北大学授予荣誉教授称号。2014年，Claude Esling教授荣获中国政府友谊奖。