[周惠久论坛] 邀请讲座人Irene J. Beyerlein 教授
【邀请讲座人】： Irene J. Beyerlein 教授
Beyerlein教授在复合材料及多晶金属材料的多尺度模拟计算与分析方面有二十多年的经验，同时在金属材料的结构演化和变形机制方面取得了杰出的成果。目前，她已发表超过260篇高水平的学术论文，其中44篇Acta Materialia，H因子45，国际会议特邀报告30余次，出版学术著作一本，与他人合作完成7本专著。目前任University of Lorraine客座教授，同时获得University of New Hampshire女性科学与工程协会和NSF ADVANCE STEM奖，International Journal of Plasticity青年研究者奖, Acta Materialia杰出审稿人奖，中国国家外专局“111计划”客座教授，西安交通大学客座教授等30多项国际荣誉。
【报告题目】Twin formation, Propagation, and Intersections at the Mesoscale
时间: 10:00-12:00 am, May. 25th, 2018
摘要：Hexagonal close packed (HCP) crystalline materials, such as Mg and Ti, can provide a potential solution to the ever-increasing portfolio of structural applications that require advanced materials with unprecedented combinations of mechanical properties. Successful incorporation of HCP materials into engineering designs is, however, hindered by their limited plasticity. Perhaps one of the most important and puzzling underlying mechanisms governing their plastic behavior is deformation twinning, which form in these materials under straining and most often at the boundaries between the crystals. The nucleation of twins both inside the crystal and at crystalline boundaries has mostly been addressed at the atomistic scale level. In our research, we employ crystal plasticity based micromechanics model to establish and understand the concept of first formation of twin embryos, propagation inside crystals and across their boundaries, and twin expansion and apply it to Mg and Ti and many of their alloys of great technical interest. This knowledge and insight will be used to accelerate materials discovery and design of HCP alloys of low-density, high strength, high toughness alloys, reducing weight and fuel consumption.