Nanoscale origins of the damage tolerance of the high-entropy alloy CrMnFeCoNi
Abstract
Damage tolerance can be an elusive characteristic of structural materials requiring both high strength and ductility, properties that are often mutually exclusive. High-entropy alloys are of interest in this regard. Specifically, the single-phase CrMnFeCoNi alloy displays tensile strength levels of ~1 GPa, excellent ductility (~60–70%) and exceptional fracture toughness (KJIc>200M Pa√m). Here through the use of in situ straining in an aberration-corrected transmission electron microscope, we report on the salient atomistic to micro-scale mechanisms underlying the origin of these properties. We identify a synergy of multiple deformation mechanisms, rarely achieved in metallic alloys, which generates high strength, work hardening and ductility, including the easy motion of Shockley partials, their interactions to form stacking-fault parallelepipeds, and arrest at planar slip bands of undissociated dislocations. In conclusion, we further show that crack propagation is impeded by twinned, nanoscale bridges that form between the near-tip crack faces and delay fracture by shielding the crack tip.
- Authors:
-
- Zhejiang Univ., Hangzhou (China)
- Univ. of Pittsburgh, PA (United States). Dept. of Mechanical Engineering and Materials Science
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
- Zhejiang Univ., Hangzhou (China); Univ. of Pittsburgh, PA (United States). Dept. of Mechanical Engineering and Materials Science
- Ruhr Univ., Bochum (Germany)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1255543
- Alternate Identifier(s):
- OSTI ID: 1266020; OSTI ID: 1415949
- Grant/Contract Number:
- 2015CB659300; AC05-00OR22725; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 6; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Zhang, ZiJiao, Mao, M. M., Wang, Jiangwei, Gludovatz, Bernd, Zhang, Ze, Mao, Scott X., George, Easo P., Yu, Qian, and Ritchie, Robert O. Nanoscale origins of the damage tolerance of the high-entropy alloy CrMnFeCoNi. United States: N. p., 2015.
Web. doi:10.1038/ncomms10143.
Zhang, ZiJiao, Mao, M. M., Wang, Jiangwei, Gludovatz, Bernd, Zhang, Ze, Mao, Scott X., George, Easo P., Yu, Qian, & Ritchie, Robert O. Nanoscale origins of the damage tolerance of the high-entropy alloy CrMnFeCoNi. United States. https://doi.org/10.1038/ncomms10143
Zhang, ZiJiao, Mao, M. M., Wang, Jiangwei, Gludovatz, Bernd, Zhang, Ze, Mao, Scott X., George, Easo P., Yu, Qian, and Ritchie, Robert O. Wed .
"Nanoscale origins of the damage tolerance of the high-entropy alloy CrMnFeCoNi". United States. https://doi.org/10.1038/ncomms10143. https://www.osti.gov/servlets/purl/1255543.
@article{osti_1255543,
title = {Nanoscale origins of the damage tolerance of the high-entropy alloy CrMnFeCoNi},
author = {Zhang, ZiJiao and Mao, M. M. and Wang, Jiangwei and Gludovatz, Bernd and Zhang, Ze and Mao, Scott X. and George, Easo P. and Yu, Qian and Ritchie, Robert O.},
abstractNote = {Damage tolerance can be an elusive characteristic of structural materials requiring both high strength and ductility, properties that are often mutually exclusive. High-entropy alloys are of interest in this regard. Specifically, the single-phase CrMnFeCoNi alloy displays tensile strength levels of ~1 GPa, excellent ductility (~60–70%) and exceptional fracture toughness (KJIc>200M Pa√m). Here through the use of in situ straining in an aberration-corrected transmission electron microscope, we report on the salient atomistic to micro-scale mechanisms underlying the origin of these properties. We identify a synergy of multiple deformation mechanisms, rarely achieved in metallic alloys, which generates high strength, work hardening and ductility, including the easy motion of Shockley partials, their interactions to form stacking-fault parallelepipeds, and arrest at planar slip bands of undissociated dislocations. In conclusion, we further show that crack propagation is impeded by twinned, nanoscale bridges that form between the near-tip crack faces and delay fracture by shielding the crack tip.},
doi = {10.1038/ncomms10143},
journal = {Nature Communications},
number = ,
volume = 6,
place = {United States},
year = {Wed Dec 09 00:00:00 EST 2015},
month = {Wed Dec 09 00:00:00 EST 2015}
}
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Influence of Annealing on Microstructure and Mechanical Properties of a Nanocrystalline CrCoNi Medium-Entropy Alloy
text, January 2018
- Schuh, Benjamin; Völker, Bernhard; Todt, Juraj
- Deutsches Elektronen-Synchrotron, DESY, Hamburg
Microstructure and Mechanical Properties Evolution of the Al, C-Containing CoCrFeNiMn-Type High-Entropy Alloy during Cold Rolling
journal, December 2017
- Klimova, Margarita; Stepanov, Nikita; Shaysultanov, Dmitry
- Materials, Vol. 11, Issue 1