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Unconventional Deformation Behaviours of Nanoscaled High-Entropy Alloys.

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.

SUBMITTER: Bu Y

PROVIDER: S-EPMC7512340 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature

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Unconventional Deformation Behaviours of Nanoscaled High-Entropy Alloys.

Bu Yeqiang Y Peng Shenyou S Wu Shiwei S Wei Yujie Y Wang Gang G Liu Jiabin J Wang Hongtao H

Entropy (Basel, Switzerland) 20181011 10

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 cor ...[more]

PMID: 33265866

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