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Nanoscale origins of the damage tolerance of the high-entropy alloy CrMnFeCoNi
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...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4682111/ https://www.ncbi.nlm.nih.gov/pubmed/26647978 http://dx.doi.org/10.1038/ncomms10143 |
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author | Zhang, ZiJiao Mao, M. M. Wang, Jiangwei Gludovatz, Bernd Zhang, Ze Mao, Scott X. George, Easo P. Yu, Qian Ritchie, Robert O. |
author_facet | Zhang, ZiJiao Mao, M. M. Wang, Jiangwei Gludovatz, Bernd Zhang, Ze Mao, Scott X. George, Easo P. Yu, Qian Ritchie, Robert O. |
author_sort | Zhang, ZiJiao |
collection | PubMed |
description | 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 (K(JIc)>200 MPa√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. 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. |
format | Online Article Text |
id | pubmed-4682111 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-46821112015-12-29 Nanoscale origins of the damage tolerance of the high-entropy alloy CrMnFeCoNi Zhang, ZiJiao Mao, M. M. Wang, Jiangwei Gludovatz, Bernd Zhang, Ze Mao, Scott X. George, Easo P. Yu, Qian Ritchie, Robert O. Nat Commun Article 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 (K(JIc)>200 MPa√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. 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. Nature Publishing Group 2015-12-09 /pmc/articles/PMC4682111/ /pubmed/26647978 http://dx.doi.org/10.1038/ncomms10143 Text en Copyright © 2015, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article 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 |
title | Nanoscale origins of the damage tolerance of the high-entropy alloy CrMnFeCoNi |
title_full | Nanoscale origins of the damage tolerance of the high-entropy alloy CrMnFeCoNi |
title_fullStr | Nanoscale origins of the damage tolerance of the high-entropy alloy CrMnFeCoNi |
title_full_unstemmed | Nanoscale origins of the damage tolerance of the high-entropy alloy CrMnFeCoNi |
title_short | Nanoscale origins of the damage tolerance of the high-entropy alloy CrMnFeCoNi |
title_sort | nanoscale origins of the damage tolerance of the high-entropy alloy crmnfeconi |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4682111/ https://www.ncbi.nlm.nih.gov/pubmed/26647978 http://dx.doi.org/10.1038/ncomms10143 |
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