Mechanical properties of high-entropy alloys with emphasis on face-centered cubic alloys

Li, Zezhou; Zhao, Shiteng; Ritchie, Robert O.; Meyers, Marc A.

doi:10.1016/j.pmatsci.2018.12.003

Title: Mechanical properties of high-entropy alloys with emphasis on face-centered cubic alloys

Journal Article · Tue Dec 18 00:00:00 EST 2018 · Progress in Materials Science

DOI:https://doi.org/10.1016/j.pmatsci.2018.12.003· OSTI ID:1634203

Li, Zezhou ^[1]; Zhao, Shiteng ^[2]; Ritchie, Robert O. ^[2]; Meyers, Marc A. ^[1]

Univ. of California, San Diego, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)

HHigh-entropy alloys (HEAs), also known as multi-principal element alloys or multi-component alloys, have been the subject of numerous investigations since they were first described in 2004. The earliest HEA was the equiatomic CrMnFeCoNi “Cantor” alloy, but HEAs now encompass a broad class of metallic and ceramic systems. The concept of utilizing the high entropy of mixing to develop stable multi-element alloys may not be scientifically correct but has produced extraordinary mechanical properties in specific HEAs, mainly CrCoNi-based alloys, associated with their continuous work-hardening rate that is sustained to large plastic strains (~0.5) and at low temperatures. This, in combination with the high frictional forces on dislocations and a propensity for twinning, leads to outstandingly high fracture toughness values (exceeding 200 MPa·m^1/2) and resistance to shear-band formation under dynamic loading. The critical shear strain for the onset of adiabatic shear band formation is ~7 for the Cantor alloy, much higher than that for conventional alloys, suggesting superior ballistic properties. The slower diffusion rates resulting from the multi-element environment contribute to the excellent intermediate-temperature performance. We review the principal mechanical properties of these alloys with emphasis on the face-centered cubic systems, such as the CrCoNi-based alloys. Their favorable mechanical properties and ease of processing by conventional means suggest extensive utilization in many future structural applications.

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

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

OSTI ID:: 1634203

Alternate ID(s):: OSTI ID: 1636758

Journal Information:: Progress in Materials Science, Vol. 102, Issue C; ISSN 0079-6425

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 393 works

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