Cargando…

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...

Descripción completa

Detalles Bibliográficos
Autores principales: Zhang, Yongfeng, Huang, Hanchen
Formato: Texto
Lenguaje:English
Publicado: Springer 2008
Materias:
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
_version_ 1782183129155371008
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