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

doi:10.1088/1674-1056/26/12/126802

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.

Keywords: Cu/Ag multilayers nanoindentation molecular dynamics interface

Received: 24 July 2017
Revised: 24 August 2017
Accepted manuscript online:

PACS:	68.90.+g	(Other topics in structure, and nonelectronic properties of surfaces and interfaces; thin films and low-dimensional structures)
	61.46.-w	(Structure of nanoscale materials)
	62.25.-g	(Mechanical properties of nanoscale systems)
	67.30.hp	(Interfaces)

Fund: 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).

Corresponding Authors: Qi-Hong Fang
E-mail: fangqh1327@hnu.edu.cn

Cite this article:

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) Molecular dynamics study of plastic deformation mechanism in Cu/Ag multilayers 2017 Chin. Phys. B 26 126802

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

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