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Do Twin Boundaries Always Strengthen Metal Nanowires?
It has been widely reported that twin boundaries strengthen nanowires regardless of their morphology—that is, the strength of nanowires goes up as twin spacing goes down. This article shows that twin boundaries do not always strengthen nanowires. Using classical molecular dynamics simulations, the a...
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Formato: | Texto |
Lenguaje: | English |
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Springer
2008
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2894070/ https://www.ncbi.nlm.nih.gov/pubmed/20596424 http://dx.doi.org/10.1007/s11671-008-9198-1 |
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author | Zhang, Yongfeng Huang, Hanchen |
author_facet | Zhang, Yongfeng Huang, Hanchen |
author_sort | Zhang, Yongfeng |
collection | PubMed |
description | It has been widely reported that twin boundaries strengthen nanowires regardless of their morphology—that is, the strength of nanowires goes up as twin spacing goes down. This article shows that twin boundaries do not always strengthen nanowires. Using classical molecular dynamics simulations, the authors show that whether twin boundaries strengthen nanowires depends on the necessary stress for dislocation nucleation, which in turn depends on surface morphologies. When nanowires are circular cylindrical, the necessary stress of dislocation nucleation is high and the presence of twin boundaries lowers this stress; twin boundaries soften nanowires. In contrast, when nanowires are square cylindrical, the necessary stress of dislocation nucleation is low, and a higher stress is required for dislocations to penetrate twin boundaries; they strengthen nanowires. |
format | Text |
id | pubmed-2894070 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2008 |
publisher | Springer |
record_format | MEDLINE/PubMed |
spelling | pubmed-28940702010-06-30 Do Twin Boundaries Always Strengthen Metal Nanowires? Zhang, Yongfeng Huang, Hanchen Nanoscale Res Lett Nano Express It has been widely reported that twin boundaries strengthen nanowires regardless of their morphology—that is, the strength of nanowires goes up as twin spacing goes down. This article shows that twin boundaries do not always strengthen nanowires. Using classical molecular dynamics simulations, the authors show that whether twin boundaries strengthen nanowires depends on the necessary stress for dislocation nucleation, which in turn depends on surface morphologies. When nanowires are circular cylindrical, the necessary stress of dislocation nucleation is high and the presence of twin boundaries lowers this stress; twin boundaries soften nanowires. In contrast, when nanowires are square cylindrical, the necessary stress of dislocation nucleation is low, and a higher stress is required for dislocations to penetrate twin boundaries; they strengthen nanowires. Springer 2008-11-11 /pmc/articles/PMC2894070/ /pubmed/20596424 http://dx.doi.org/10.1007/s11671-008-9198-1 Text en Copyright ©2008 to the authors |
spellingShingle | Nano Express Zhang, Yongfeng Huang, Hanchen Do Twin Boundaries Always Strengthen Metal Nanowires? |
title | Do Twin Boundaries Always Strengthen Metal Nanowires? |
title_full | Do Twin Boundaries Always Strengthen Metal Nanowires? |
title_fullStr | Do Twin Boundaries Always Strengthen Metal Nanowires? |
title_full_unstemmed | Do Twin Boundaries Always Strengthen Metal Nanowires? |
title_short | Do Twin Boundaries Always Strengthen Metal Nanowires? |
title_sort | do twin boundaries always strengthen metal nanowires? |
topic | Nano Express |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2894070/ https://www.ncbi.nlm.nih.gov/pubmed/20596424 http://dx.doi.org/10.1007/s11671-008-9198-1 |
work_keys_str_mv | AT zhangyongfeng dotwinboundariesalwaysstrengthenmetalnanowires AT huanghanchen dotwinboundariesalwaysstrengthenmetalnanowires |