Strengthening and softening in gradient nanotwinned FCC metallic multilayers

doi:10.1088/1674-1056/ac4cc6

Abstract Plastic-deformation behaviors of gradient nanotwinned (GNT) metallic multilayers are investigated in nanoscale via molecular dynamics simulation. The evolution law of deformation behaviors of GNT metallic multilayers with different stacking fault energies (SFEs) during nanoindentation is revealed. The deformation behavior transforms from the dislocation dynamics to the twinning/detwinning in the GNT Ag, Cu, to Al with SFE increasing. In addition, it is found that the GNT Ag and GNT Cu strengthen in the case of a larger twin gradient based on more significant twin boundary (TB) strengthening and dislocation strengthening, while the GNT Al softens due to more TB migration and dislocation nucleation from TB at a larger twin gradient. The softening mechanism is further analyzed theoretically. These results not only provide an atomic insight into the plastic-deformation behaviors of certain GNT metallic multilayers with different SFEs, but also give a guideline to design the GNT metallic multilayers with required mechanical properties.

Keywords: plastic deformation gradient nanotwinned metallic multilayers nanoindentation molecular dynamics simulation

Received: 09 October 2021
Revised: 21 December 2021
Accepted manuscript online: 19 January 2022

PACS:	62.20.F-	(Deformation and plasticity)
	61.72.Mm	(Grain and twin boundaries)
	68.35.bd	(Metals and alloys)
	02.70.Ns	(Molecular dynamics and particle methods)

Fund: The authors would like to deeply appreciate the support from the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (Grant Nos. 51621004, 11572118, 51871092, and 11772122) and the National Key Research and Development Program of China (Grant No. 2016YFB0700300).

Corresponding Authors: Qihong Fang, Jia Li
E-mail: fangqh1327@hnu.edu.cn;lijia123@hnu.edu.cn

Cite this article:

Yuanyuan Tian(田圆圆), Gangjie Luo(罗港杰), Qihong Fang(方棋洪), Jia Li(李甲), and Jing Peng(彭静) Strengthening and softening in gradient nanotwinned FCC metallic multilayers 2022 Chin. Phys. B 31 066204

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