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Strain rate dependency of dislocation plasticity
Dislocation glide is a general deformation mode, governing the strength of metals. Via discrete dislocation dynamics and molecular dynamics simulations, we investigate the strain rate and dislocation density dependence of the strength of bulk copper and aluminum single crystals. An analytical relati...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7988163/ https://www.ncbi.nlm.nih.gov/pubmed/33758183 http://dx.doi.org/10.1038/s41467-021-21939-1 |
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author | Fan, Haidong Wang, Qingyuan El-Awady, Jaafar A. Raabe, Dierk Zaiser, Michael |
author_facet | Fan, Haidong Wang, Qingyuan El-Awady, Jaafar A. Raabe, Dierk Zaiser, Michael |
author_sort | Fan, Haidong |
collection | PubMed |
description | Dislocation glide is a general deformation mode, governing the strength of metals. Via discrete dislocation dynamics and molecular dynamics simulations, we investigate the strain rate and dislocation density dependence of the strength of bulk copper and aluminum single crystals. An analytical relationship between material strength, dislocation density, strain rate and dislocation mobility is proposed, which agrees well with current simulations and published experiments. Results show that material strength displays a decreasing regime (strain rate hardening) and then increasing regime (classical forest hardening) as the dislocation density increases. Accordingly, the strength displays universally, as the strain rate increases, a strain rate-independent regime followed by a strain rate hardening regime. All results are captured by a single scaling function, which relates the scaled strength to a coupling parameter between dislocation density and strain rate. Such coupling parameter also controls the localization of plasticity, fluctuations of dislocation flow and distribution of dislocation velocity. |
format | Online Article Text |
id | pubmed-7988163 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-79881632021-04-16 Strain rate dependency of dislocation plasticity Fan, Haidong Wang, Qingyuan El-Awady, Jaafar A. Raabe, Dierk Zaiser, Michael Nat Commun Article Dislocation glide is a general deformation mode, governing the strength of metals. Via discrete dislocation dynamics and molecular dynamics simulations, we investigate the strain rate and dislocation density dependence of the strength of bulk copper and aluminum single crystals. An analytical relationship between material strength, dislocation density, strain rate and dislocation mobility is proposed, which agrees well with current simulations and published experiments. Results show that material strength displays a decreasing regime (strain rate hardening) and then increasing regime (classical forest hardening) as the dislocation density increases. Accordingly, the strength displays universally, as the strain rate increases, a strain rate-independent regime followed by a strain rate hardening regime. All results are captured by a single scaling function, which relates the scaled strength to a coupling parameter between dislocation density and strain rate. Such coupling parameter also controls the localization of plasticity, fluctuations of dislocation flow and distribution of dislocation velocity. Nature Publishing Group UK 2021-03-23 /pmc/articles/PMC7988163/ /pubmed/33758183 http://dx.doi.org/10.1038/s41467-021-21939-1 Text en © The Author(s) 2021, corrected publication 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Fan, Haidong Wang, Qingyuan El-Awady, Jaafar A. Raabe, Dierk Zaiser, Michael Strain rate dependency of dislocation plasticity |
title | Strain rate dependency of dislocation plasticity |
title_full | Strain rate dependency of dislocation plasticity |
title_fullStr | Strain rate dependency of dislocation plasticity |
title_full_unstemmed | Strain rate dependency of dislocation plasticity |
title_short | Strain rate dependency of dislocation plasticity |
title_sort | strain rate dependency of dislocation plasticity |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7988163/ https://www.ncbi.nlm.nih.gov/pubmed/33758183 http://dx.doi.org/10.1038/s41467-021-21939-1 |
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