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Entropy 2018, 20(10), 778; https://doi.org/10.3390/e20100778

Unconventional Deformation Behaviours of Nanoscaled High-Entropy Alloys

1
School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
2
LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
3
Laboratory for Microstructures, Shanghai University, Shanghai 200444, China
4
Institute of Applied Mechanics, Zhejiang University, Hangzhou 310027, China
*
Authors to whom correspondence should be addressed.
Received: 7 September 2018 / Revised: 20 September 2018 / Accepted: 28 September 2018 / Published: 11 October 2018
(This article belongs to the Special Issue New Advances in High-Entropy Alloys)
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Abstract

The bulk high-entropy alloys (HEAs) exhibit similar deformation behaviours as traditional metals. These bulk behaviours are likely an averaging of the behaviours exhibited at the nanoscale. Herein, in situ atomic-scale observation of deformation behaviours in nanoscaled CoCrCuFeNi face-centred cubic (FCC) HEA was performed. The deformation behaviours of this nanoscaled FCC HEA (i.e., nanodisturbances and phase transformations) were distinct from those of nanoscaled traditional FCC metals and corresponding bulk HEA. First-principles calculations revealed an obvious fluctuation of the stacking fault energy and stability difference at the atomic scale in the HEA. The stability difference was highlighted only in the nanoscaled HEA and induced unconventional deformation behaviours. Our work suggests that the nanoscaled HEA may provide more chances to discover the long-expected essential distinction between the HEAs and traditional metals. View Full-Text
Keywords: nanoscaled high-entropy alloys; nanodisturbances; phase transformations; atomic-scale unstable nanoscaled high-entropy alloys; nanodisturbances; phase transformations; atomic-scale unstable
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Bu, Y.; Peng, S.; Wu, S.; Wei, Y.; Wang, G.; Liu, J.; Wang, H. Unconventional Deformation Behaviours of Nanoscaled High-Entropy Alloys. Entropy 2018, 20, 778.

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