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Healing of Nanocracks by Disclinations

Author(s)
Xu, Guoqiang; Demkowicz, Michael J.
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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Abstract
We present a new mechanism—discovered using molecular dynamics simulations—that leads to complete healing of nanocracks. This mechanism relies on the generation of crystal defects known as disclinations by migrating grain boundaries. Crack healing by disclinations does not require any compressive loads applied normal to the crack faces and even occurs under monotonic tensile loading. By closing small cracks and suppressing the propagation of others, this mechanism may provide a novel way of mitigating internal damage that influences ductility in nanocrystalline metals.
Date issued
2013-10
URI
http://hdl.handle.net/1721.1/84982
Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Xu, G. Q., and M. J. Demkowicz. “Healing of Nanocracks by Disclinations.” Physical Review Letters 111, no. 14 (October 2013). © 2013 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114

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