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Thermodynamics of crystalline and amorphous plasticity at atomic-scale

报告人:王云江   中国科学院力学研究所  副研究员 

地点:土木工程楼520

时间:2017427日(周四)上午1010

摘要:The plastic deformation mechanisms and their units of crystalline and amorphous metals are quite different in terms of their distinct structural features. However, they have a lot of common features in terms of the thermodynamics and kinetics of defect nucleation and evolution, which strongly determines the plastic deformation of such materials. Here, the thermodynamics and kinetics of the plastic deformation units of both crystalline and amorphous metals are quantitively discussed via both classic and advanced atomistic simulations. I focus on the temperature and stress (or strain rate) dependence of the plastic units (dislocation, shear transformation) at atomic-scale, which is closely related to the thermodynamic and kinetic concepts of the activation entropy, and activation volume. In other words, the free energy landscape of the plastic deformation units and their dependences on temperature and stress are the central content of this talk. A comprehensive understanding of the activation parameters will benefit building a physics-information deformation map of both crystalline and amorphous solids.

报告人简介:王云江,中国科学院力学研究所副研究员。2010年于清华大学获理学博士学位,2010年至2013年在日本大阪大学、京都大学从事研究工作,历任日本学术振兴会(JSPS)特别研究员、特定助理教授等职。2014年任非线性力学国家重点实验室任副研究员。主要从事纳米金属结构、非晶合金等新型材料物理与力学的多时空尺度模拟工作。在纳米晶体蠕变、非晶变形热力学、加速分子动力学等领域开展了系列工作,已发表SCI论文30余篇,包括JMPS, Acta Mater., Phys. Rev. B, App. Phys. Lett.等物理、材料、力学领域著名学术刊物。2010年获得日本学术振兴会JSPS奖学金,2017年度入选中国科学院青年创新促进委员会会员。目前主持国家自然科学基金面上项目、青年科学基金、青促会专项经费等项目

发布人:郭雅芳(力学系)