Segregation mediated heterogeneous structure in a metastable β titanium alloy with a superior combination of strength and ductility

Abstract In β titanium alloys, the β stabilizers segregate easily and considerable effort has been devoted to alleviate/eliminate the segregation. In this work, instead of addressing the segregation problems, the segregation was utilized to develop a novel microstructure consisting of a nanometre-gr...

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Autores principales:	Junheng Gao, John Nutter, Xingguang Liu, Dikai Guan, Yuhe Huang, David Dye, W. Mark Rainforth
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e41a376ecd9541bdabe1cb84fd641ec7
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spelling	oai:doaj.org-article:e41a376ecd9541bdabe1cb84fd641ec72021-12-02T16:08:27ZSegregation mediated heterogeneous structure in a metastable β titanium alloy with a superior combination of strength and ductility10.1038/s41598-018-25899-32045-2322https://doaj.org/article/e41a376ecd9541bdabe1cb84fd641ec72018-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-25899-3https://doaj.org/toc/2045-2322Abstract In β titanium alloys, the β stabilizers segregate easily and considerable effort has been devoted to alleviate/eliminate the segregation. In this work, instead of addressing the segregation problems, the segregation was utilized to develop a novel microstructure consisting of a nanometre-grained duplex (α+β) structure and micrometre scale β phase with superior mechanical properties. An as-cast Ti-9Mo-6W alloy exhibited segregation of Mo and W at the tens of micrometre scale. This was subjected to cold rolling and flash annealing at 820 oC for 2 and 5 mins. The solidification segregation of Mo and W leads to a locally different microstructure after cold rolling (i.e., nanostructured β phase in the regions rich in Mo and W and plate-like martensite and β phase in regions relatively poor in Mo and W), which play a decisive role in the formation of the heterogeneous microstructure. Tensile tests showed that this alloy exhibited a superior combination of high yield strength (692 MPa), high tensile strength (1115 MPa), high work hardening rate and large uniform elongation (33.5%). More importantly, the new technique proposed in this work could be potentially applicable to other alloy systems with segregation problems.Junheng GaoJohn NutterXingguang LiuDikai GuanYuhe HuangDavid DyeW. Mark RainforthNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-11 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Junheng Gao John Nutter Xingguang Liu Dikai Guan Yuhe Huang David Dye W. Mark Rainforth Segregation mediated heterogeneous structure in a metastable β titanium alloy with a superior combination of strength and ductility
description	Abstract In β titanium alloys, the β stabilizers segregate easily and considerable effort has been devoted to alleviate/eliminate the segregation. In this work, instead of addressing the segregation problems, the segregation was utilized to develop a novel microstructure consisting of a nanometre-grained duplex (α+β) structure and micrometre scale β phase with superior mechanical properties. An as-cast Ti-9Mo-6W alloy exhibited segregation of Mo and W at the tens of micrometre scale. This was subjected to cold rolling and flash annealing at 820 oC for 2 and 5 mins. The solidification segregation of Mo and W leads to a locally different microstructure after cold rolling (i.e., nanostructured β phase in the regions rich in Mo and W and plate-like martensite and β phase in regions relatively poor in Mo and W), which play a decisive role in the formation of the heterogeneous microstructure. Tensile tests showed that this alloy exhibited a superior combination of high yield strength (692 MPa), high tensile strength (1115 MPa), high work hardening rate and large uniform elongation (33.5%). More importantly, the new technique proposed in this work could be potentially applicable to other alloy systems with segregation problems.
format	article
author	Junheng Gao John Nutter Xingguang Liu Dikai Guan Yuhe Huang David Dye W. Mark Rainforth
author_facet	Junheng Gao John Nutter Xingguang Liu Dikai Guan Yuhe Huang David Dye W. Mark Rainforth
author_sort	Junheng Gao
title	Segregation mediated heterogeneous structure in a metastable β titanium alloy with a superior combination of strength and ductility
title_short	Segregation mediated heterogeneous structure in a metastable β titanium alloy with a superior combination of strength and ductility
title_full	Segregation mediated heterogeneous structure in a metastable β titanium alloy with a superior combination of strength and ductility
title_fullStr	Segregation mediated heterogeneous structure in a metastable β titanium alloy with a superior combination of strength and ductility
title_full_unstemmed	Segregation mediated heterogeneous structure in a metastable β titanium alloy with a superior combination of strength and ductility
title_sort	segregation mediated heterogeneous structure in a metastable β titanium alloy with a superior combination of strength and ductility
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/e41a376ecd9541bdabe1cb84fd641ec7
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Segregation mediated heterogeneous structure in a metastable β titanium alloy with a superior combination of strength and ductility

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