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

Abstract

The high-entropy alloys are an intriguing new class of metallic materials that derive their properties not from a single dominant constituent, such as iron in steels, nor from the presence of a second phase, such as in nickel-base superalloys, but rather comprise multi-element systems that crystallize as a single phase, despite containing high concentrations (~20 at.%) of five or more elements with different crystal structures. Indeed, we have recently reported on one such single-phase high-entropy alloy, NiCoCrFeMn, which displays exceptional strength and toughness at cryogenic temperatures. Here which displays unprecedented strength-toughness properties that exceed those of all high-entropy alloys and most multi-phase alloys. With roomtemperature tensile strengths of almost 1 GPa and KJIc fracture-toughness values above 200 MPa.m 1/2 (with crack-growth toughnesses exceeding 300 MPa.m 1/2), the strength, ductility and toughness of the NiCoCr alloy actually improve at cryogenic temperatures to unprecedented levels of strengths above 1.3 GPa, failure strains up to 90% and K JIc values of 275 MPa.m 1/2 (with crackgrowth toughnesses above 400 MPa.m 1/2). These 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) (SC-22)
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 = {The high-entropy alloys are an intriguing new class of metallic materials that derive their properties not from a single dominant constituent, such as iron in steels, nor from the presence of a second phase, such as in nickel-base superalloys, but rather comprise multi-element systems that crystallize as a single phase, despite containing high concentrations (~20 at.%) of five or more elements with different crystal structures. Indeed, we have recently reported on one such single-phase high-entropy alloy, NiCoCrFeMn, which displays exceptional strength and toughness at cryogenic temperatures. Here which displays unprecedented strength-toughness properties that exceed those of all high-entropy alloys and most multi-phase alloys. With roomtemperature tensile strengths of almost 1 GPa and KJIc fracture-toughness values above 200 MPa.m 1/2 (with crack-growth toughnesses exceeding 300 MPa.m 1/2), the strength, ductility and toughness of the NiCoCr alloy actually improve at cryogenic temperatures to unprecedented levels of strengths above 1.3 GPa, failure strains up to 90% and KJIc values of 275 MPa.m 1/2 (with crackgrowth toughnesses above 400 MPa.m 1/2). These 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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    Works referencing / citing this record:

    Plastic deformation transition in FeCrCoNiAl x high-entropy alloys
    journal, July 2019