Elastic strain-induced amorphization in high-entropy alloys

Yeqiang Bu, Yuan Wu (), Zhifeng Lei, Xiaoyuan Yuan, Leqing Liu, Peng Wang, Xiongjun Liu, Honghui Wu, Jiabin Liu (), Hongtao Wang (), R. O. Ritchie, Zhaoping Lu () and Wei Yang
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Yeqiang Bu: Zhejiang University
Yuan Wu: University of Science and Technology Beijing
Zhifeng Lei: Hunan University
Xiaoyuan Yuan: University of Science and Technology Beijing
Leqing Liu: University of Science and Technology Beijing
Peng Wang: Shanghai University
Xiongjun Liu: University of Science and Technology Beijing
Honghui Wu: University of Science and Technology Beijing
Jiabin Liu: Zhejiang University
Hongtao Wang: Zhejiang University
R. O. Ritchie: University of California
Zhaoping Lu: University of Science and Technology Beijing
Wei Yang: Zhejiang University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Elastic stability is the basis for understanding structural responses to external stimuli in crystalline solids, including melting, incipient plasticity and fracture. In this work, elastic stability is investigated in a series of high-entropy alloys (HEAs) using in situ mechanical tests and atomic-resolution characterization in transmission electron microscopy. Under tensile loading, the HEA lattices are observed to undergo a sudden loss of ordering as the elastic strain reached ∽ 10%. Such elastic strain-induced amorphization stands in intrinsic contrast to previously reported dislocation-mediated elastic instability and defect accumulation-mediated amorphization, introducing a form of elastic instability. Together with the first principle calculations and atomic-resolution chemical mapping, we identify that the elastic strain-induced amorphization is closely related to the depressed dislocation nucleation due to the local atomic environment inhomogeneity of HEAs. Our findings provide insights for the understanding of the fundamental nature of physical mechanical phenomena like elastic instability and incipient plasticity.

Date: 2024
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DOI: 10.1038/s41467-024-48619-0

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