中国物理B ›› 2021, Vol. 30 ›› Issue (7): 73103-073103.doi: 10.1088/1674-1056/abe1a0

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Plasticity and melting characteristics of metal Al with Ti-cluster under shock loading

Dong-Lin Luan(栾栋林)1, Ya-Bin Wang(王亚斌)1,†, Guo-Meng Li(李果蒙)2, Lei Yuan(袁磊)3, and Jun Chen(陈军)4,5,‡   

  1. 1 School of Mechatronic Engineering, Beijing Institute of Technology, Beijing 100081, China;
    2 System Engineering Research Institute, Beijing 100094, China;
    3 Beijing Special Vehicle Research Institute, Beijing 100072, China;
    4 Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
    5 Center for Applied Physics and Technology, Peking University, Beijing 100871, China
  • 收稿日期:2020-11-13 修回日期:2021-01-28 接受日期:2021-02-01 出版日期:2021-06-22 发布日期:2021-07-02
  • 通讯作者: Ya-Bin Wang, Jun Chen E-mail:wangyabin@bit.edu.cn;jun_chen@iapcm.ac.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 12072044).

Plasticity and melting characteristics of metal Al with Ti-cluster under shock loading

Dong-Lin Luan(栾栋林)1, Ya-Bin Wang(王亚斌)1,†, Guo-Meng Li(李果蒙)2, Lei Yuan(袁磊)3, and Jun Chen(陈军)4,5,‡   

  1. 1 School of Mechatronic Engineering, Beijing Institute of Technology, Beijing 100081, China;
    2 System Engineering Research Institute, Beijing 100094, China;
    3 Beijing Special Vehicle Research Institute, Beijing 100072, China;
    4 Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
    5 Center for Applied Physics and Technology, Peking University, Beijing 100871, China
  • Received:2020-11-13 Revised:2021-01-28 Accepted:2021-02-01 Online:2021-06-22 Published:2021-07-02
  • Contact: Ya-Bin Wang, Jun Chen E-mail:wangyabin@bit.edu.cn;jun_chen@iapcm.ac.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 12072044).

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摘要： Impurity agglomeration has a significant influence on shock response of metal materials. In this paper, the mechanism of Ti-clusters in metal Al under shock loading is investigated by non-equilibrium molecular dynamics simulations. Our results show that the Ti-cluster has obvious effects on the dislocation initiation and melting of bulk Al. First, the Ti clusters induces the strain concentrate and leads the dislocations to be initiated from the interface of Ti cluster. Second, dislocation distribution from the Ti-cluster model results in a formation of a grid-like structure, while the dislocation density is reduced compared with that from the perfect Al model. Third, the critical shock velocity of dislocation from the Ti-cluster model is lower than from perfect Al model. Furthermore, it is also found that the temperature near the interface of Ti-cluster is 100 K-150 K higher than in the other areas, which means that Ti-cluster interface melts earlier than the bulk area.

关键词: molecular dynamics, impurity cluster, dislocation, shock loading

Abstract: Impurity agglomeration has a significant influence on shock response of metal materials. In this paper, the mechanism of Ti-clusters in metal Al under shock loading is investigated by non-equilibrium molecular dynamics simulations. Our results show that the Ti-cluster has obvious effects on the dislocation initiation and melting of bulk Al. First, the Ti clusters induces the strain concentrate and leads the dislocations to be initiated from the interface of Ti cluster. Second, dislocation distribution from the Ti-cluster model results in a formation of a grid-like structure, while the dislocation density is reduced compared with that from the perfect Al model. Third, the critical shock velocity of dislocation from the Ti-cluster model is lower than from perfect Al model. Furthermore, it is also found that the temperature near the interface of Ti-cluster is 100 K-150 K higher than in the other areas, which means that Ti-cluster interface melts earlier than the bulk area.

Key words: molecular dynamics, impurity cluster, dislocation, shock loading

中图分类号:  (Molecular dynamics and other numerical methods)

  • 31.15.xv
61.72.Hh (Indirect evidence of dislocations and other defects (resistivity, slip, creep, strains, internal friction, EPR, NMR, etc.)) 36.40.-c (Atomic and molecular clusters)