Shear band mediated ω phase transformation in Nb single crystals deformed at 77 K

Phase transformation is rare in pure body-centered cubic (BCC) metals due to the associated high energy barrier. Here, omega (ω) phase transformation in single-crystal niobium (Nb) under compression at 77 K was studied by atomistic characterization and density functional theory (DFT) calculation. Th...

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Autores principales:	Xiyao Li, Qingkun Zhao, Qiannan Wang, Yanzhong Tian, Haofei Zhou, Jiangwei Wang
Formato:	article
Lenguaje:	EN
Publicado:	Taylor & Francis Group 2021
Materias:	body-centered cubic niobium ω phase shear band bcc-to-ω phase transformation Materials of engineering and construction. Mechanics of materials TA401-492
Acceso en línea:	https://doaj.org/article/0888df5347ad435290a741dc4c669f1e
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id	oai:doaj.org-article:0888df5347ad435290a741dc4c669f1e
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spelling	oai:doaj.org-article:0888df5347ad435290a741dc4c669f1e2021-11-04T15:51:55ZShear band mediated ω phase transformation in Nb single crystals deformed at 77 K2166-383110.1080/21663831.2021.1992523https://doaj.org/article/0888df5347ad435290a741dc4c669f1e2021-12-01T00:00:00Zhttp://dx.doi.org/10.1080/21663831.2021.1992523https://doaj.org/toc/2166-3831Phase transformation is rare in pure body-centered cubic (BCC) metals due to the associated high energy barrier. Here, omega (ω) phase transformation in single-crystal niobium (Nb) under compression at 77 K was studied by atomistic characterization and density functional theory (DFT) calculation. The ω phases were found to nucleate preferentially at the boundaries of 112 shear bands, via a sequence of BCC-to-ω structural transformation induced by shear stress. Theoretically, calculations reveal that the formation of a shear transition region can reduce the energy barrier of BCC-to-ω phase transformation. These findings provide insights into the phase transformation involved in the cryogenic deformation of bulk BCC metals.Xiyao LiQingkun ZhaoQiannan WangYanzhong TianHaofei ZhouJiangwei WangTaylor & Francis Grouparticlebody-centered cubicniobiumω phaseshear bandbcc-to-ω phase transformationMaterials of engineering and construction. Mechanics of materialsTA401-492ENMaterials Research Letters, Vol 9, Iss 12, Pp 523-530 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	body-centered cubic niobium ω phase shear band bcc-to-ω phase transformation Materials of engineering and construction. Mechanics of materials TA401-492
spellingShingle	body-centered cubic niobium ω phase shear band bcc-to-ω phase transformation Materials of engineering and construction. Mechanics of materials TA401-492 Xiyao Li Qingkun Zhao Qiannan Wang Yanzhong Tian Haofei Zhou Jiangwei Wang Shear band mediated ω phase transformation in Nb single crystals deformed at 77 K
description	Phase transformation is rare in pure body-centered cubic (BCC) metals due to the associated high energy barrier. Here, omega (ω) phase transformation in single-crystal niobium (Nb) under compression at 77 K was studied by atomistic characterization and density functional theory (DFT) calculation. The ω phases were found to nucleate preferentially at the boundaries of 112 shear bands, via a sequence of BCC-to-ω structural transformation induced by shear stress. Theoretically, calculations reveal that the formation of a shear transition region can reduce the energy barrier of BCC-to-ω phase transformation. These findings provide insights into the phase transformation involved in the cryogenic deformation of bulk BCC metals.
format	article
author	Xiyao Li Qingkun Zhao Qiannan Wang Yanzhong Tian Haofei Zhou Jiangwei Wang
author_facet	Xiyao Li Qingkun Zhao Qiannan Wang Yanzhong Tian Haofei Zhou Jiangwei Wang
author_sort	Xiyao Li
title	Shear band mediated ω phase transformation in Nb single crystals deformed at 77 K
title_short	Shear band mediated ω phase transformation in Nb single crystals deformed at 77 K
title_full	Shear band mediated ω phase transformation in Nb single crystals deformed at 77 K
title_fullStr	Shear band mediated ω phase transformation in Nb single crystals deformed at 77 K
title_full_unstemmed	Shear band mediated ω phase transformation in Nb single crystals deformed at 77 K
title_sort	shear band mediated ω phase transformation in nb single crystals deformed at 77 k
publisher	Taylor & Francis Group
publishDate	2021
url	https://doaj.org/article/0888df5347ad435290a741dc4c669f1e
work_keys_str_mv	AT xiyaoli shearbandmediatedōphasetransformationinnbsinglecrystalsdeformedat77k AT qingkunzhao shearbandmediatedōphasetransformationinnbsinglecrystalsdeformedat77k AT qiannanwang shearbandmediatedōphasetransformationinnbsinglecrystalsdeformedat77k AT yanzhongtian shearbandmediatedōphasetransformationinnbsinglecrystalsdeformedat77k AT haofeizhou shearbandmediatedōphasetransformationinnbsinglecrystalsdeformedat77k AT jiangweiwang shearbandmediatedōphasetransformationinnbsinglecrystalsdeformedat77k
_version_	1718444693029650432

Shear band mediated ω phase transformation in Nb single crystals deformed at 77 K

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