Damage-tolerant nanotwinned metals with nanovoids under radiation environments

Material performance in extreme radiation environments is central to the design of future nuclear reactors. Radiation induces significant damage in the form of dislocation loops and voids in irradiated materials, and continuous radiation often leads to void growth and subsequent void swelling in met...

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Main Authors:	Chen, Y., Yu, K Y., Liu, Y., Shao, S., Wang, H., Kirk, M. A., Wang, J., Zhang, X.
Format:	Online
Language:	English
Published:	Nature Pub. Group 2015
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4421808/

id	pubmed-4421808
recordtype	oai_dc
spelling	pubmed-44218082015-05-20 Damage-tolerant nanotwinned metals with nanovoids under radiation environments Chen, Y. Yu, K Y. Liu, Y. Shao, S. Wang, H. Kirk, M. A. Wang, J. Zhang, X. Article Material performance in extreme radiation environments is central to the design of future nuclear reactors. Radiation induces significant damage in the form of dislocation loops and voids in irradiated materials, and continuous radiation often leads to void growth and subsequent void swelling in metals with low stacking fault energy. Here we show that by using in situ heavy ion irradiation in a transmission electron microscope, pre-introduced nanovoids in nanotwinned Cu efficiently absorb radiation-induced defects accompanied by gradual elimination of nanovoids, enhancing radiation tolerance of Cu. In situ studies and atomistic simulations reveal that such remarkable self-healing capability stems from high density of coherent and incoherent twin boundaries that rapidly capture and transport point defects and dislocation loops to nanovoids, which act as storage bins for interstitial loops. This study describes a counterintuitive yet significant concept: deliberate introduction of nanovoids in conjunction with nanotwins enables unprecedented damage tolerance in metallic materials. Nature Pub. Group 2015-04-24 /pmc/articles/PMC4421808/ /pubmed/25906997 http://dx.doi.org/10.1038/ncomms8036 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/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Chen, Y. Yu, K Y. Liu, Y. Shao, S. Wang, H. Kirk, M. A. Wang, J. Zhang, X.
spellingShingle	Chen, Y. Yu, K Y. Liu, Y. Shao, S. Wang, H. Kirk, M. A. Wang, J. Zhang, X. Damage-tolerant nanotwinned metals with nanovoids under radiation environments
author_facet	Chen, Y. Yu, K Y. Liu, Y. Shao, S. Wang, H. Kirk, M. A. Wang, J. Zhang, X.
author_sort	Chen, Y.
title	Damage-tolerant nanotwinned metals with nanovoids under radiation environments
title_short	Damage-tolerant nanotwinned metals with nanovoids under radiation environments
title_full	Damage-tolerant nanotwinned metals with nanovoids under radiation environments
title_fullStr	Damage-tolerant nanotwinned metals with nanovoids under radiation environments
title_full_unstemmed	Damage-tolerant nanotwinned metals with nanovoids under radiation environments
title_sort	damage-tolerant nanotwinned metals with nanovoids under radiation environments
description	Material performance in extreme radiation environments is central to the design of future nuclear reactors. Radiation induces significant damage in the form of dislocation loops and voids in irradiated materials, and continuous radiation often leads to void growth and subsequent void swelling in metals with low stacking fault energy. Here we show that by using in situ heavy ion irradiation in a transmission electron microscope, pre-introduced nanovoids in nanotwinned Cu efficiently absorb radiation-induced defects accompanied by gradual elimination of nanovoids, enhancing radiation tolerance of Cu. In situ studies and atomistic simulations reveal that such remarkable self-healing capability stems from high density of coherent and incoherent twin boundaries that rapidly capture and transport point defects and dislocation loops to nanovoids, which act as storage bins for interstitial loops. This study describes a counterintuitive yet significant concept: deliberate introduction of nanovoids in conjunction with nanotwins enables unprecedented damage tolerance in metallic materials.
publisher	Nature Pub. Group
publishDate	2015
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4421808/
_version_	1613219972156227584

Damage-tolerant nanotwinned metals with nanovoids under radiation environments

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