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

Abstract

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.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [7]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Montanuniversitat Leoben and Erich Schmid Inst. of Materials Science, Leoben (Austria)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  6. Ruhr Univ., Bochum (Germany); Univ. of Tennessee, Knoxville, TN (United States)
  7. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1237143
Alternate Identifier(s):
OSTI ID: 1414745
Grant/Contract Number:  
AC05-00OR22725; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; physical sciences; materials science; nanotechnology

Citation Formats

Gludovatz, Bernd, Hohenwarter, Anton, Thurston, Keli V. S., Bei, Hongbin, Wu, Zhenggang, George, Easo P., and Ritchie, Robert O. Exceptional damage-tolerance of a medium-entropy alloy CrCoNi at cryogenic temperatures. United States: N. p., 2016. Web. doi:10.1038/ncomms10602.
Gludovatz, Bernd, Hohenwarter, Anton, Thurston, Keli V. S., Bei, Hongbin, Wu, Zhenggang, George, Easo P., & Ritchie, Robert O. Exceptional damage-tolerance of a medium-entropy alloy CrCoNi at cryogenic temperatures. United States. doi:10.1038/ncomms10602.
Gludovatz, Bernd, Hohenwarter, Anton, Thurston, Keli V. S., Bei, Hongbin, Wu, Zhenggang, George, Easo P., and Ritchie, Robert O. Tue . "Exceptional damage-tolerance of a medium-entropy alloy CrCoNi at cryogenic temperatures". United States. doi:10.1038/ncomms10602. https://www.osti.gov/servlets/purl/1237143.
@article{osti_1237143,
title = {Exceptional damage-tolerance of a medium-entropy alloy CrCoNi at cryogenic temperatures},
author = {Gludovatz, Bernd and Hohenwarter, Anton and Thurston, Keli V. S. and Bei, Hongbin and Wu, Zhenggang and George, Easo P. and Ritchie, Robert O.},
abstractNote = {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.},
doi = {10.1038/ncomms10602},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {2016},
month = {2}
}

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