Amorphization in extreme deformation of the CrMnFeCoNi high-entropy alloy

Zhao, Shiteng; Li, Zezhou; Zhu, Chaoyi; Yang, Wen; Zhang, Zhouran; Armstrong, David J.; Grant, Patrick S.; Ritchie, Robert O.; Meyers, Marc A.

doi:10.1126/sciadv.abb3108

Amorphization in extreme deformation of the CrMnFeCoNi high-entropy alloy

Journal Article · Fri Jan 29 00:00:00 EST 2021 · Science Advances

DOI:https://doi.org/10.1126/sciadv.abb3108· OSTI ID:1763795

^[1]; ^[2]; Zhu, Chaoyi ^[3]; Yang, Wen ^[2]; ^[4]; ^[4]; ^[4]; ^[1]; ^[2]

University of California, Berkeley, Berkeley, CA 94720, USA.
University of California, San Diego, La Jolla, CA 92093, USA.
Carnegie Mellon University, Pittsburgh, PA 15213, USA.
University of Oxford, Oxford OX1 3PH, UK.

Ever-harsher service conditions in the future will call for materials with increasing ability to undergo deformation without sustaining damage while retaining high strength. Prime candidates for these conditions are certain high-entropy alloys (HEAs), which have extraordinary work-hardening ability and toughness. By subjecting the equiatomic CrMnFeCoNi HEA to severe plastic deformation through swaging followed by either quasi-static compression or dynamic deformation in shear, we observe a dense structure comprising stacking faults, twins, transformation from the face-centered cubic to the hexagonal close-packed structure, and, of particular note, amorphization. The coordinated propagation of stacking faults and twins along {111} planes generates high-deformation regions, which can reorganize into hexagonal packets; when the defect density in these regions reaches a critical level, they generate islands of amorphous material. These regions can have outstanding mechanical properties, which provide additional strengthening and/or toughening mechanisms to enhance the capability of these alloys to withstand extreme loading conditions.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of California, San Diego, La Jolla, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Legacy Management (LM), Office of Field Operations; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-05CH11231; NA0002080; NA0003842

OSTI ID:: 1763795

Alternate ID(s):: OSTI ID: 1764565
OSTI ID: 1784851

Journal Information:: Science Advances, Journal Name: Science Advances Journal Issue: 5 Vol. 7; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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