Deformation and failure of the CrCoNi medium-entropy alloy subjected to extreme shock loading

Zhao, Shiteng; Yin, Sheng; Liang, Xiao; Cao, Fuhua; Yu, Qin; Zhang, Ruopeng; Dai, Lanhong; Ruestes, Carlos J.; Ritchie, Robert O.; Minor, Andrew M.

doi:10.1126/sciadv.adf8602

Title: Deformation and failure of the CrCoNi medium-entropy alloy subjected to extreme shock loading

Journal Article · 04 May 2023 · Science Advances

DOI: https://doi.org/10.1126/sciadv.adf8602 · OSTI ID:2234122

^[1]; Yin, Sheng ^[2]; Liang, Xiao ^[3]; Cao, Fuhua ^[4];

^[2]; Zhang, Ruopeng ^[5]; Dai, Lanhong ^[4];

^[6];

^[7];

^[8]

Beihang University (China); Tianmushan Laboratory (China)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Beihang University (China)
Chinese Academy of Sciences (CAS), Beijing (China)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Center for Electron Microscopy and Molecular Foundry
IMDEA Materials Institute, Madrid (Spain); Instituto Interdisciplinario de Ciencias Básicas (ICB-CONICET UNCUYO) (Argentina)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Center for Electron Microscopy and Molecular Foundry; Univ. of California, Berkeley, CA (United States)

The extraordinary work hardening ability and fracture toughness of the face-centered cubic (fcc) high-entropy alloys render them ideal candidates for many structural applications. Here, the deformation and failure mechanisms of an equiatomic CrCoNi medium-entropyalloy (MEA) were investigated by powerful laser-driven shock experiments. Multiscale characterization demonstrates that profuse planar defects including stacking faults, nanotwins, and hexagonal nanolamella were generated during shock compression, forming a three-dimensional network. During shock release, the MEA fractured by strong tensile deformation and numerous voids was observed in the vicinity of the fracture plane. High defect populations, nanorecrystallization, and amorphization were found adjacent to these areas of localized deformation. Molecular dynamics simulations corroborate the experimental results and suggest that deformation-induced defects formed before void nucleation govern the geometry of void growth and delay their coalescence. Our results indicate that the CrCoNi-based alloys are impact resistant, damage tolerant, and potentially suitable in applications under extreme conditions.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2234122

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 18 Vol. 9; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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