Indentation-induced plastic behaviour of nanotwinned Cu/high entropy alloy FeCoCrNi nanolaminate: an atomic simulation

Hui Feng; Jingwen Tang; Haotian Chen; Yuanyuan Tian; Qihong Fang; Jia Li; Feng Liu

doi:10.1039/D0RA00518E

Indentation-induced plastic behaviour of nanotwinned Cu/high entropy alloy FeCoCrNi nanolaminate: an atomic simulation

Hui Feng,^a Jingwen Tang,^a Haotian Chen,^a Yuanyuan Tian,^a Qihong Fang,*^a Jia Li

*^a and Feng Liu*^b

Author affiliations

* Corresponding authors

^a State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, PR China
E-mail: fangqh1327@hnu.edu.cn, lijia123@hnu.edu.cn

^b State Key Laboratory of Powder Metallurgy, Central South University, Changsha, PR China
E-mail: fengliu@csu.edu.cn

Abstract

Using large-scale molecular dynamics (MD) simulations, the effects of interface and layer number in the nanoindentation response of experimentally observed nanotwinned Cu/high entropy alloy (HEA) FeCoCrNi nanolaminate are studied. The dislocations are nucleated and emitted, which are more limited to the first twinning layer > second twinning layer > HEA layer. The stacking fault strengthening is pronounced due to the obvious difference of stacking fault energy between Cu and HEA, which can be rarely observed from the previous work in traditional alloys and metals. After the indentation induced deformation, the nanotwinned Cu/HEA FeCoCrNi nanolaminates for different layer numbers generate a mass of Shockley partial dislocations to cause the good plasticity, attributed to the strong strain gradient effect. The strong layer number and interface structure effects found here can provide insight for the design of advanced nanolaminate with high strength and good plasticity.

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https://doi.org/10.1039/D0RA00518E

Article type

Paper

Submitted

17 Jan 2020

Accepted

28 Feb 2020

First published

02 Mar 2020

This article is Open Access

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RSC Adv., 2020,10, 9187-9192

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Indentation-induced plastic behaviour of nanotwinned Cu/high entropy alloy FeCoCrNi nanolaminate: an atomic simulation

H. Feng, J. Tang, H. Chen, Y. Tian, Q. Fang, J. Li and F. Liu, RSC Adv., 2020, 10, 9187 DOI: 10.1039/D0RA00518E

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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Indentation-induced plastic behaviour of nanotwinned Cu/high entropy alloy FeCoCrNi nanolaminate: an atomic simulation

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Indentation-induced plastic behaviour of nanotwinned Cu/high entropy alloy FeCoCrNi nanolaminate: an atomic simulation

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