中国物理B ›› 2019, Vol. 28 ›› Issue (12): 126201-126201.doi: 10.1088/1674-1056/ab4f61

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

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

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

  1. 1 Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha 410082, China;
    2 Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
    3 Center for Applied Physics and Technology, Peking University, Beijing 100087, China;
    4 College of Materials Science and Engineering, Hunan University, Changsha 410082, China;
    5 National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, Mianyang 621900, China
  • 收稿日期:2019-09-06 修回日期:2019-10-17 出版日期:2019-12-05 发布日期:2019-12-05
  • 通讯作者: Jun Chen, Wangyu Hu E-mail:jun_chen@iapcm.ac.cn;wyuhu@hnu.edu.cn
  • 基金资助:
    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), and the Science Challenge Project of China (Grant No. TZ2016001).

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

Xueyang Zhang(张学阳)1,2, Kun Wang(王昆)2, Jun Chen(陈军)2,3, Wangyu Hu(胡望宇)4, Wenjun Zhu(祝文军)5, Shifang Xiao(肖时芳)1, Huiqiu Deng(邓辉球)1, Mengqiu Cai(蔡孟秋)1   

  1. 1 Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha 410082, China;
    2 Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
    3 Center for Applied Physics and Technology, Peking University, Beijing 100087, China;
    4 College of Materials Science and Engineering, Hunan University, Changsha 410082, China;
    5 National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, Mianyang 621900, China
  • Received:2019-09-06 Revised:2019-10-17 Online:2019-12-05 Published:2019-12-05
  • Contact: Jun Chen, Wangyu Hu E-mail:jun_chen@iapcm.ac.cn;wyuhu@hnu.edu.cn
  • Supported by:
    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), and the Science Challenge Project of China (Grant No. TZ2016001).

摘要: Many of our previous studies have discussed the shock response of symmetrical grain boundaries in iron bicrystals. In 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.

关键词: shock-loading, grain boundary migration, iron, phase transition

Abstract: Many of our previous studies have discussed the shock response of symmetrical grain boundaries in iron bicrystals. In 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.

Key words: shock-loading, grain boundary migration, iron, phase transition

中图分类号:  (High-pressure effects in solids and liquids)

  • 62.50.-p
47.40.Nm (Shock wave interactions and shock effects)