Exceptional damage-tolerance of a medium-entropy alloy CrCoNi at cryogenic temperatures

Gludovatz, Bernd; Hohenwarter, Anton; Thurston, Keli V. S.; Bei, Hongbin; Wu, Zhenggang; George, Easo P.; Ritchie, Robert O.

doi:10.1038/ncomms10602

Title: Exceptional damage-tolerance of a medium-entropy alloy CrCoNi at cryogenic temperatures

Journal Article · Tue Feb 02 00:00:00 EST 2016 · Nature Communications

DOI:https://doi.org/10.1038/ncomms10602· OSTI ID:1237143

Gludovatz, Bernd ^[1]; Hohenwarter, Anton ^[2]; Thurston, Keli V. S. ^[3]; Bei, Hongbin ^[4]; Wu, Zhenggang ^[5]; George, Easo P. ^[6]; Ritchie, Robert O. ^[7]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Montanuniversitat Leoben and Erich Schmid Inst. of Materials Science, Leoben (Austria)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Ruhr Univ., Bochum (Germany); Univ. of Tennessee, Knoxville, TN (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

High-entropy alloys are an intriguing new class of metallic materials that derive their properties from being multi-element systems that can crystallize as a single phase, despite containing high concentrations of five or more elements with different crystal structures. Here we examine an equiatomic medium-entropy alloy containing only three elements, CrCoNi, as a single-phase face-centred cubic solid solution, which displays strength-toughness properties that exceed those of all high-entropy alloys and most multi-phase alloys. At room temperature, the alloy shows tensile strengths of almost 1 GPa, failure strains of ~70% and K JIc fracture-toughness values above 200 MPa m 1/2 ; at cryogenic temperatures strength, ductility and toughness of the CrCoNi alloy improve to strength levels above 1.3 GPa, failure strains up to 90% and K JIc values of 275 MPa m 1/2 . Such properties appear to result from continuous steady strain hardening, which acts to suppress plastic instability, resulting from pronounced dislocation activity and deformation-induced nano-twinning.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; AC02-05CH11231

OSTI ID:: 1237143

Alternate ID(s):: OSTI ID: 1414745

Journal Information:: Nature Communications, Vol. 7; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 958 works

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