中国物理B ›› 2017, Vol. 26 ›› Issue (12): 126802-126802.doi: 10.1088/1674-1056/26/12/126802

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

Molecular dynamics study of plastic deformation mechanism in Cu/Ag multilayers

Yuan-Yuan Tian(田圆圆), Jia Li(李甲), Ze-Ying Hu(胡泽英), Zhi-Peng Wang(王志鹏), Qi-Hong Fang(方棋洪)   

  1. 1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China;
    2. College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China
  • 收稿日期:2017-07-24 修回日期:2017-08-24 出版日期:2017-12-05 发布日期:2017-12-05
  • 通讯作者: Qi-Hong Fang E-mail:fangqh1327@hnu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11572118 and 11372103), the Hunan Provincial Science Fund for Distinguished Young Scholars, China (Grant No. 2015JJ1006), and the National Key Research and Development Program of China (Grant No. 2016YFB0700300).

Molecular dynamics study of plastic deformation mechanism in Cu/Ag multilayers

Yuan-Yuan Tian(田圆圆)1,2, Jia Li(李甲)1,2, Ze-Ying Hu(胡泽英)1,2, Zhi-Peng Wang(王志鹏)1,2, Qi-Hong Fang(方棋洪)1,2   

  1. 1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China;
    2. College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China
  • Received:2017-07-24 Revised:2017-08-24 Online:2017-12-05 Published:2017-12-05
  • Contact: Qi-Hong Fang E-mail:fangqh1327@hnu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11572118 and 11372103), the Hunan Provincial Science Fund for Distinguished Young Scholars, China (Grant No. 2015JJ1006), and the National Key Research and Development Program of China (Grant No. 2016YFB0700300).

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摘要： The plastic deformation mechanism of Cu/Ag multilayers is investigated by molecular dynamics (MD) simulation in a nanoindentation process. The result shows that due to the interface barrier, the dislocations pile-up at the interface and then the plastic deformation of the Ag matrix occurs due to the nucleation and emission of dislocations from the interface and the dislocation propagation through the interface. In addition, it is found that the incipient plastic deformation of Cu/Ag multilayers is postponed, compared with that of bulk single-crystal Cu. The plastic deformation of Cu/Ag multilayers is affected by the lattice mismatch more than by the difference in stacking fault energy (SFE) between Cu and Ag. The dislocation pile-up at the interface is determined by the obstruction of the mismatch dislocation network and the attraction of the image force. Furthermore, this work provides a basis for further understanding and tailoring metal multilayers with good mechanical properties, which may facilitate the design and development of multilayer materials with low cost production strategies.

关键词: Cu/Ag multilayers, nanoindentation, molecular dynamics, interface

Abstract: The plastic deformation mechanism of Cu/Ag multilayers is investigated by molecular dynamics (MD) simulation in a nanoindentation process. The result shows that due to the interface barrier, the dislocations pile-up at the interface and then the plastic deformation of the Ag matrix occurs due to the nucleation and emission of dislocations from the interface and the dislocation propagation through the interface. In addition, it is found that the incipient plastic deformation of Cu/Ag multilayers is postponed, compared with that of bulk single-crystal Cu. The plastic deformation of Cu/Ag multilayers is affected by the lattice mismatch more than by the difference in stacking fault energy (SFE) between Cu and Ag. The dislocation pile-up at the interface is determined by the obstruction of the mismatch dislocation network and the attraction of the image force. Furthermore, this work provides a basis for further understanding and tailoring metal multilayers with good mechanical properties, which may facilitate the design and development of multilayer materials with low cost production strategies.

Key words: Cu/Ag multilayers, nanoindentation, molecular dynamics, interface

中图分类号:  (Other topics in structure, and nonelectronic properties of surfaces and interfaces; thin films and low-dimensional structures)

  • 68.90.+g
61.46.-w (Structure of nanoscale materials) 62.25.-g (Mechanical properties of nanoscale systems) 67.30.hp (Interfaces)