Interactions between Dislocations and Penta-Twins in Metallic Nanocrystals

Dislocation interactions with twin boundary (TB) have been well-established in nanotwinned metals. Penta-twins, as an extreme of crystal twinning, are tacitly assumed to be more effective at blocking dislocation motions than conventional single or coplanar nanotwins. However, the mechanism underlyin...

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Autores principales:	Yingbin Chen, Qishan Huang, Shuchun Zhao, Haofei Zhou, Jiangwei Wang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	penta-twin dislocation twin boundary interaction in situ nanomechanical testing Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/1a688fbfb6494e079d7be696e16c5a0b
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spelling	oai:doaj.org-article:1a688fbfb6494e079d7be696e16c5a0b2021-11-25T18:21:50ZInteractions between Dislocations and Penta-Twins in Metallic Nanocrystals10.3390/met111117752075-4701https://doaj.org/article/1a688fbfb6494e079d7be696e16c5a0b2021-11-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1775https://doaj.org/toc/2075-4701Dislocation interactions with twin boundary (TB) have been well-established in nanotwinned metals. Penta-twins, as an extreme of crystal twinning, are tacitly assumed to be more effective at blocking dislocation motions than conventional single or coplanar nanotwins. However, the mechanism underlying the interactions between dislocations and penta-twins remains largely unclear. Here, by combining in situ transmission electron microscope (TEM) nanomechanical testing and atomistic simulations, we rationalize the fundamental interactions between dislocations and penta-twins in Au nanocrystals. Our results reveal that the interactions between dislocations and penta-twins show some similar behaviors to the ones in the cases of coplanar nanotwins, including dislocation impedance at TBs, cross-slip into the twinning plane and transmission across the TB. In addition, penta-twins also exhibit some unique behaviors during dislocation interactions, including multiple cross-slip, dislocation-induced core dissociation and climb-induced annihilation/absorption at the penta-twin core. These findings enhance our mechanistic understanding of dislocation behaviors in penta-twins, shedding light on the accessible design of high-performance nanomaterials with multi-twinned nanostructures.Yingbin ChenQishan HuangShuchun ZhaoHaofei ZhouJiangwei WangMDPI AGarticlepenta-twindislocationtwin boundaryinteractionin situ nanomechanical testingMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1775, p 1775 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	penta-twin dislocation twin boundary interaction in situ nanomechanical testing Mining engineering. Metallurgy TN1-997
spellingShingle	penta-twin dislocation twin boundary interaction in situ nanomechanical testing Mining engineering. Metallurgy TN1-997 Yingbin Chen Qishan Huang Shuchun Zhao Haofei Zhou Jiangwei Wang Interactions between Dislocations and Penta-Twins in Metallic Nanocrystals
description	Dislocation interactions with twin boundary (TB) have been well-established in nanotwinned metals. Penta-twins, as an extreme of crystal twinning, are tacitly assumed to be more effective at blocking dislocation motions than conventional single or coplanar nanotwins. However, the mechanism underlying the interactions between dislocations and penta-twins remains largely unclear. Here, by combining in situ transmission electron microscope (TEM) nanomechanical testing and atomistic simulations, we rationalize the fundamental interactions between dislocations and penta-twins in Au nanocrystals. Our results reveal that the interactions between dislocations and penta-twins show some similar behaviors to the ones in the cases of coplanar nanotwins, including dislocation impedance at TBs, cross-slip into the twinning plane and transmission across the TB. In addition, penta-twins also exhibit some unique behaviors during dislocation interactions, including multiple cross-slip, dislocation-induced core dissociation and climb-induced annihilation/absorption at the penta-twin core. These findings enhance our mechanistic understanding of dislocation behaviors in penta-twins, shedding light on the accessible design of high-performance nanomaterials with multi-twinned nanostructures.
format	article
author	Yingbin Chen Qishan Huang Shuchun Zhao Haofei Zhou Jiangwei Wang
author_facet	Yingbin Chen Qishan Huang Shuchun Zhao Haofei Zhou Jiangwei Wang
author_sort	Yingbin Chen
title	Interactions between Dislocations and Penta-Twins in Metallic Nanocrystals
title_short	Interactions between Dislocations and Penta-Twins in Metallic Nanocrystals
title_full	Interactions between Dislocations and Penta-Twins in Metallic Nanocrystals
title_fullStr	Interactions between Dislocations and Penta-Twins in Metallic Nanocrystals
title_full_unstemmed	Interactions between Dislocations and Penta-Twins in Metallic Nanocrystals
title_sort	interactions between dislocations and penta-twins in metallic nanocrystals
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/1a688fbfb6494e079d7be696e16c5a0b
work_keys_str_mv	AT yingbinchen interactionsbetweendislocationsandpentatwinsinmetallicnanocrystals AT qishanhuang interactionsbetweendislocationsandpentatwinsinmetallicnanocrystals AT shuchunzhao interactionsbetweendislocationsandpentatwinsinmetallicnanocrystals AT haofeizhou interactionsbetweendislocationsandpentatwinsinmetallicnanocrystals AT jiangweiwang interactionsbetweendislocationsandpentatwinsinmetallicnanocrystals
_version_	1718411243281186816

Interactions between Dislocations and Penta-Twins in Metallic Nanocrystals

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