In-plane anisotropy and twin boundary effects in vanadium nitride under nanoindentation

Abstract Twin boundaries (TBs) have been observed in and introduced into nonmetallic materials in recent years, which brought new concepts for the design of new structural materials. However, the roles of TB on the mechanical properties and strengthening/softening of transition metal nitrides remain...

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Autores principales:	Tao Fu, Xianghe Peng, Cheng Huang, Henggao Xiang, Shayuan Weng, Zhongchang Wang, Ning Hu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/76ba2743af144c19a8fd71afc615b2b4
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spelling	oai:doaj.org-article:76ba2743af144c19a8fd71afc615b2b42021-12-02T12:32:31ZIn-plane anisotropy and twin boundary effects in vanadium nitride under nanoindentation10.1038/s41598-017-05062-02045-2322https://doaj.org/article/76ba2743af144c19a8fd71afc615b2b42017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05062-0https://doaj.org/toc/2045-2322Abstract Twin boundaries (TBs) have been observed in and introduced into nonmetallic materials in recent years, which brought new concepts for the design of new structural materials. However, the roles of TB on the mechanical properties and strengthening/softening of transition metal nitrides remain unclear. To investigate the TB effects and the in-plane anisotropy, nanoindentations on VN (111) films with and without TB were simulated with molecular dynamics, in which a cylindrical indenter was used, and its longitudinal axis were assigned along <112> and <110>, respectively. We found that the effect of the indenter orientation is insignificant in the elastic stage, but significant in the following inelastic deformation. Different deformation mechanisms can be found for inelastic deformation, such as twinning and dislocation glide. The migration of TB can be observed, which may release the internal stress, resulting in softening; while the dislocation locking and pileup at TB can enhance the strength. We also found that the strengthening/softening induced by TB depends on the deformation mechanisms induced by indenter directions.Tao FuXianghe PengCheng HuangHenggao XiangShayuan WengZhongchang WangNing HuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Tao Fu Xianghe Peng Cheng Huang Henggao Xiang Shayuan Weng Zhongchang Wang Ning Hu In-plane anisotropy and twin boundary effects in vanadium nitride under nanoindentation
description	Abstract Twin boundaries (TBs) have been observed in and introduced into nonmetallic materials in recent years, which brought new concepts for the design of new structural materials. However, the roles of TB on the mechanical properties and strengthening/softening of transition metal nitrides remain unclear. To investigate the TB effects and the in-plane anisotropy, nanoindentations on VN (111) films with and without TB were simulated with molecular dynamics, in which a cylindrical indenter was used, and its longitudinal axis were assigned along <112> and <110>, respectively. We found that the effect of the indenter orientation is insignificant in the elastic stage, but significant in the following inelastic deformation. Different deformation mechanisms can be found for inelastic deformation, such as twinning and dislocation glide. The migration of TB can be observed, which may release the internal stress, resulting in softening; while the dislocation locking and pileup at TB can enhance the strength. We also found that the strengthening/softening induced by TB depends on the deformation mechanisms induced by indenter directions.
format	article
author	Tao Fu Xianghe Peng Cheng Huang Henggao Xiang Shayuan Weng Zhongchang Wang Ning Hu
author_facet	Tao Fu Xianghe Peng Cheng Huang Henggao Xiang Shayuan Weng Zhongchang Wang Ning Hu
author_sort	Tao Fu
title	In-plane anisotropy and twin boundary effects in vanadium nitride under nanoindentation
title_short	In-plane anisotropy and twin boundary effects in vanadium nitride under nanoindentation
title_full	In-plane anisotropy and twin boundary effects in vanadium nitride under nanoindentation
title_fullStr	In-plane anisotropy and twin boundary effects in vanadium nitride under nanoindentation
title_full_unstemmed	In-plane anisotropy and twin boundary effects in vanadium nitride under nanoindentation
title_sort	in-plane anisotropy and twin boundary effects in vanadium nitride under nanoindentation
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/76ba2743af144c19a8fd71afc615b2b4
work_keys_str_mv	AT taofu inplaneanisotropyandtwinboundaryeffectsinvanadiumnitrideundernanoindentation AT xianghepeng inplaneanisotropyandtwinboundaryeffectsinvanadiumnitrideundernanoindentation AT chenghuang inplaneanisotropyandtwinboundaryeffectsinvanadiumnitrideundernanoindentation AT henggaoxiang inplaneanisotropyandtwinboundaryeffectsinvanadiumnitrideundernanoindentation AT shayuanweng inplaneanisotropyandtwinboundaryeffectsinvanadiumnitrideundernanoindentation AT zhongchangwang inplaneanisotropyandtwinboundaryeffectsinvanadiumnitrideundernanoindentation AT ninghu inplaneanisotropyandtwinboundaryeffectsinvanadiumnitrideundernanoindentation
_version_	1718394041344720896

In-plane anisotropy and twin boundary effects in vanadium nitride under nanoindentation

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