Deformation Mechanisms of FCC-Structured Metallic Nanocrystal with Incoherent Twin Boundary

Incoherent twin boundaries (ITBs) can significantly affect the mechanical properties of twin-structured metals. However, most previous studies have focused on the deformation mechanism of the coherent twin boundary (CTB), and metals with ITB-accommodated plasticity still require further investigatio...

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Autores principales:	Yang Tao, Yufeng Zhao, Zhanxin Wang, Libo Fu, Lihua Wang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	incoherent twin boundary plastic deformation dislocation metallic nanocrystal face-centered cubic Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/cde6c1f0eb404c5489e7f11656de8dcb
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spelling	oai:doaj.org-article:cde6c1f0eb404c5489e7f11656de8dcb2021-11-25T18:21:05ZDeformation Mechanisms of FCC-Structured Metallic Nanocrystal with Incoherent Twin Boundary10.3390/met111116722075-4701https://doaj.org/article/cde6c1f0eb404c5489e7f11656de8dcb2021-10-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1672https://doaj.org/toc/2075-4701Incoherent twin boundaries (ITBs) can significantly affect the mechanical properties of twin-structured metals. However, most previous studies have focused on the deformation mechanism of the coherent twin boundary (CTB), and metals with ITB-accommodated plasticity still require further investigation. In this study, deformation mechanisms of FCC-structured nanocrystal metals with ITBs were investigated using molecular dynamic (MD) simulations. We revealed that three deformation mechanisms occur in metals with ITBs. The first type of deformation was observed in Au, where the plasticity is governed by partial dislocation intersections with CTBs or reactions with each other to form Lomer–Cottrell (L–C) locks. In the second type, found in Al, the deformation is governed by reversible ITB migration. The third type of deformation, in Ni and Cu, is governed by partial dislocations emitted from the ITB or the tips of the stacking faults (SFs). The observed L–C lock formation, as well as the reversible ITB migration and partial dislocation emission from the tips of SFs, have rarely been reported before.Yang TaoYufeng ZhaoZhanxin WangLibo FuLihua WangMDPI AGarticleincoherent twin boundaryplastic deformationdislocationmetallic nanocrystalface-centered cubicMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1672, p 1672 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	incoherent twin boundary plastic deformation dislocation metallic nanocrystal face-centered cubic Mining engineering. Metallurgy TN1-997
spellingShingle	incoherent twin boundary plastic deformation dislocation metallic nanocrystal face-centered cubic Mining engineering. Metallurgy TN1-997 Yang Tao Yufeng Zhao Zhanxin Wang Libo Fu Lihua Wang Deformation Mechanisms of FCC-Structured Metallic Nanocrystal with Incoherent Twin Boundary
description	Incoherent twin boundaries (ITBs) can significantly affect the mechanical properties of twin-structured metals. However, most previous studies have focused on the deformation mechanism of the coherent twin boundary (CTB), and metals with ITB-accommodated plasticity still require further investigation. In this study, deformation mechanisms of FCC-structured nanocrystal metals with ITBs were investigated using molecular dynamic (MD) simulations. We revealed that three deformation mechanisms occur in metals with ITBs. The first type of deformation was observed in Au, where the plasticity is governed by partial dislocation intersections with CTBs or reactions with each other to form Lomer–Cottrell (L–C) locks. In the second type, found in Al, the deformation is governed by reversible ITB migration. The third type of deformation, in Ni and Cu, is governed by partial dislocations emitted from the ITB or the tips of the stacking faults (SFs). The observed L–C lock formation, as well as the reversible ITB migration and partial dislocation emission from the tips of SFs, have rarely been reported before.
format	article
author	Yang Tao Yufeng Zhao Zhanxin Wang Libo Fu Lihua Wang
author_facet	Yang Tao Yufeng Zhao Zhanxin Wang Libo Fu Lihua Wang
author_sort	Yang Tao
title	Deformation Mechanisms of FCC-Structured Metallic Nanocrystal with Incoherent Twin Boundary
title_short	Deformation Mechanisms of FCC-Structured Metallic Nanocrystal with Incoherent Twin Boundary
title_full	Deformation Mechanisms of FCC-Structured Metallic Nanocrystal with Incoherent Twin Boundary
title_fullStr	Deformation Mechanisms of FCC-Structured Metallic Nanocrystal with Incoherent Twin Boundary
title_full_unstemmed	Deformation Mechanisms of FCC-Structured Metallic Nanocrystal with Incoherent Twin Boundary
title_sort	deformation mechanisms of fcc-structured metallic nanocrystal with incoherent twin boundary
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/cde6c1f0eb404c5489e7f11656de8dcb
work_keys_str_mv	AT yangtao deformationmechanismsoffccstructuredmetallicnanocrystalwithincoherenttwinboundary AT yufengzhao deformationmechanismsoffccstructuredmetallicnanocrystalwithincoherenttwinboundary AT zhanxinwang deformationmechanismsoffccstructuredmetallicnanocrystalwithincoherenttwinboundary AT libofu deformationmechanismsoffccstructuredmetallicnanocrystalwithincoherenttwinboundary AT lihuawang deformationmechanismsoffccstructuredmetallicnanocrystalwithincoherenttwinboundary
_version_	1718411347283148800

Deformation Mechanisms of FCC-Structured Metallic Nanocrystal with Incoherent Twin Boundary

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