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Kink pair production and dislocation motion

The motion of extended defects called dislocations controls the mechanical properties of crystalline materials such as strength and ductility. Under moderate applied loads, this motion proceeds via the thermal nucleation of kink pairs. The nucleation rate is known to be a highly nonlinear function o...

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Detalles Bibliográficos
Autor principal: Fitzgerald, S. P.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5177946/
https://www.ncbi.nlm.nih.gov/pubmed/28004834
http://dx.doi.org/10.1038/srep39708
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author Fitzgerald, S. P.
author_facet Fitzgerald, S. P.
author_sort Fitzgerald, S. P.
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description The motion of extended defects called dislocations controls the mechanical properties of crystalline materials such as strength and ductility. Under moderate applied loads, this motion proceeds via the thermal nucleation of kink pairs. The nucleation rate is known to be a highly nonlinear function of the applied load, and its calculation has long been a theoretical challenge. In this article, a stochastic path integral approach is used to derive a simple, general, and exact formula for the rate. The predictions are in excellent agreement with experimental and computational investigations, and unambiguously explain the origin of the observed extreme nonlinearity. The results can also be applied to other systems modelled by an elastic string interacting with a periodic potential, such as Josephson junctions in superconductors.
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spelling pubmed-51779462016-12-29 Kink pair production and dislocation motion Fitzgerald, S. P. Sci Rep Article The motion of extended defects called dislocations controls the mechanical properties of crystalline materials such as strength and ductility. Under moderate applied loads, this motion proceeds via the thermal nucleation of kink pairs. The nucleation rate is known to be a highly nonlinear function of the applied load, and its calculation has long been a theoretical challenge. In this article, a stochastic path integral approach is used to derive a simple, general, and exact formula for the rate. The predictions are in excellent agreement with experimental and computational investigations, and unambiguously explain the origin of the observed extreme nonlinearity. The results can also be applied to other systems modelled by an elastic string interacting with a periodic potential, such as Josephson junctions in superconductors. Nature Publishing Group 2016-12-22 /pmc/articles/PMC5177946/ /pubmed/28004834 http://dx.doi.org/10.1038/srep39708 Text en Copyright © 2016, The Author(s) 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
Fitzgerald, S. P.
Kink pair production and dislocation motion
title Kink pair production and dislocation motion
title_full Kink pair production and dislocation motion
title_fullStr Kink pair production and dislocation motion
title_full_unstemmed Kink pair production and dislocation motion
title_short Kink pair production and dislocation motion
title_sort kink pair production and dislocation motion
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5177946/
https://www.ncbi.nlm.nih.gov/pubmed/28004834
http://dx.doi.org/10.1038/srep39708
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