Shock-induced migration of asymmetry tilt grain boundary in iron bicrystal: A case study of Σ3 [110]

作     者：Xueyang Zhang Kun Wang Jun Chen Wangyu Hu Wenjun Zhu Shifang Xiao Huiqiu Deng Mengqiu Cai 张学阳;王昆;陈军;胡望宇;祝文军;肖时芳;邓辉球;蔡孟秋

作者机构：Department of Applied PhysicsSchool of Physics and ElectronicsHunan UniversityChangsha 410082China Laboratory of Computational PhysicsInstitute of Applied Physics and Computational MathematicsBeijing 100088China Center for Applied Physics and TechnologyPeking UniversityBeijing 100087China College of Materials Science and EngineeringHunan UniversityChangsha 410082China National Key Laboratory of Shock Wave and Detonation PhysicsInstitute of Fluid PhysicsMianyang 621900China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2019年第28卷第12期

页      面：273-279页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0704[理学-天文学] 

基　　金：Project supported by the Fundamental Research for the Central Universities of China the National Key Laboratory Project of Shock Wave and Detonation Physics of China the Science and Technology Foundation of National Key Laboratory of Shock Wave and Detonation Physics of China the National Key R&D Program of China(Grant No.2017YFB0202303) the National Natural Science Foundation of China(Grant Nos.51871094,51871095,51571088,NSFC-NSAF U1530151,and U1830138) the Natural Science Foundation of Hunan Province of China(Grant No.2018JJ2036) the Science Challenge Project of China(Grant No.TZ2016001) 

主　　题：shock-loading grain boundary migration iron phase transition 

摘      要：Many of our previous studies have discussed the shock response of symmetrical grain boundaries in iron *** this paper, the molecular dynamics simulation of an iron bicrystal containing Σ3 [110] asymmetry tilt grain boundary(ATGB) under shock-loading is performed. We find that the shock response of asymmetric grain boundaries is quite different from that of symmetric grain boundaries. Especially, our simulation proves that shock can induce migration of asymmetric grain boundary in iron. We also find that the shape and local structure of grain boundary(GB) would not be changed during shock-induced migration of Σ3 [110] ATGB, while the phase transformation near the GB could affect migration of GB. The most important discovery is that the shock-induced shear stress difference between two sides of GB is the key factor leading to GB migration. Our simulation involves a variety of piston velocities, and the migration of GB seems to be less sensitive to the piston velocity. Finally, the kinetics of GB migration at lattice level is discussed. Our work firstly reports the simulation of shock-induced grain boundary migration in iron. It is of great significance to the theory of GB migration and material engineering.