Preparation of Multiscale α Phase by Heat Treatments and Its Effect on Tensile Properties in Metastable β Titanium Alloy Sheet

This study presents a strategy for the preparation of multiscale α phase by high/low-temperature two-step aging in metastable β titanium alloy, Ti-15Mo-3Al-2.7Nb-0.2Si. The purpose of high-temperature aging is to obtain a number of micro-scale secondary α phases (α<sub>S</sub>), besides...

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Autores principales:	Hanyu Jiang, Zhaoxin Du, Da Wang, Tianhao Gong, Xiaoming Cui, Fei Liu, Jun Cheng, Wenzhen Chen
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	TB8 titanium alloy duplex aging multiscale α phase in situ tensile testing fracture behavior Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/63ac3050e81b42dc8dca5cb40abc6284
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id	oai:doaj.org-article:63ac3050e81b42dc8dca5cb40abc6284
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spelling	oai:doaj.org-article:63ac3050e81b42dc8dca5cb40abc62842021-11-25T18:21:22ZPreparation of Multiscale α Phase by Heat Treatments and Its Effect on Tensile Properties in Metastable β Titanium Alloy Sheet10.3390/met111117082075-4701https://doaj.org/article/63ac3050e81b42dc8dca5cb40abc62842021-10-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1708https://doaj.org/toc/2075-4701This study presents a strategy for the preparation of multiscale α phase by high/low-temperature two-step aging in metastable β titanium alloy, Ti-15Mo-3Al-2.7Nb-0.2Si. The purpose of high-temperature aging is to obtain a number of micro-scale secondary α phases (α<sub>S</sub>), besides precipitation-free zones (PFZs). After that, in the second stage of low-temperature aging, the nano-scale tertiary α phase (α<sub>T</sub>) precipitates in the PFZs. The second-step aging temperature and the time at low temperature will have an important effect on α<sub>T</sub>. On the one hand, with the extension of aging time, the morphology of α<sub>T</sub> changes from dot-like to needle-like. Secondly, the increase of the second-step aging temperature will promote precipitation of α<sub>T</sub> in PFZs. The strength increases gradually with the accelerated precipitation of α<sub>T</sub>, and good plasticity is still maintained. The effect of multiscale α on fracture behavior was investigated by in situ tensile testing. Results show that cracks form a transgranular fracture along the slip line after solution treatment. After first-step aging, the crack easily passes through α<sub>S</sub> and forms an intergranular fracture. After second-step aging, the formation of multiscale α phase has a stronger effect in hindering the crack growth, which leads to crack propagation mainly by transgranular fracture. Overall, this study demonstrates that the alloy can be heat-treated to achieve an excellent match between strength and ductility, which is expected to meet the application requirements of structural materials of the new generation of aircraft.Hanyu JiangZhaoxin DuDa WangTianhao GongXiaoming CuiFei LiuJun ChengWenzhen ChenMDPI AGarticleTB8 titanium alloyduplex agingmultiscale α phasein situ tensile testingfracture behaviorMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1708, p 1708 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	TB8 titanium alloy duplex aging multiscale α phase in situ tensile testing fracture behavior Mining engineering. Metallurgy TN1-997
spellingShingle	TB8 titanium alloy duplex aging multiscale α phase in situ tensile testing fracture behavior Mining engineering. Metallurgy TN1-997 Hanyu Jiang Zhaoxin Du Da Wang Tianhao Gong Xiaoming Cui Fei Liu Jun Cheng Wenzhen Chen Preparation of Multiscale α Phase by Heat Treatments and Its Effect on Tensile Properties in Metastable β Titanium Alloy Sheet
description	This study presents a strategy for the preparation of multiscale α phase by high/low-temperature two-step aging in metastable β titanium alloy, Ti-15Mo-3Al-2.7Nb-0.2Si. The purpose of high-temperature aging is to obtain a number of micro-scale secondary α phases (α<sub>S</sub>), besides precipitation-free zones (PFZs). After that, in the second stage of low-temperature aging, the nano-scale tertiary α phase (α<sub>T</sub>) precipitates in the PFZs. The second-step aging temperature and the time at low temperature will have an important effect on α<sub>T</sub>. On the one hand, with the extension of aging time, the morphology of α<sub>T</sub> changes from dot-like to needle-like. Secondly, the increase of the second-step aging temperature will promote precipitation of α<sub>T</sub> in PFZs. The strength increases gradually with the accelerated precipitation of α<sub>T</sub>, and good plasticity is still maintained. The effect of multiscale α on fracture behavior was investigated by in situ tensile testing. Results show that cracks form a transgranular fracture along the slip line after solution treatment. After first-step aging, the crack easily passes through α<sub>S</sub> and forms an intergranular fracture. After second-step aging, the formation of multiscale α phase has a stronger effect in hindering the crack growth, which leads to crack propagation mainly by transgranular fracture. Overall, this study demonstrates that the alloy can be heat-treated to achieve an excellent match between strength and ductility, which is expected to meet the application requirements of structural materials of the new generation of aircraft.
format	article
author	Hanyu Jiang Zhaoxin Du Da Wang Tianhao Gong Xiaoming Cui Fei Liu Jun Cheng Wenzhen Chen
author_facet	Hanyu Jiang Zhaoxin Du Da Wang Tianhao Gong Xiaoming Cui Fei Liu Jun Cheng Wenzhen Chen
author_sort	Hanyu Jiang
title	Preparation of Multiscale α Phase by Heat Treatments and Its Effect on Tensile Properties in Metastable β Titanium Alloy Sheet
title_short	Preparation of Multiscale α Phase by Heat Treatments and Its Effect on Tensile Properties in Metastable β Titanium Alloy Sheet
title_full	Preparation of Multiscale α Phase by Heat Treatments and Its Effect on Tensile Properties in Metastable β Titanium Alloy Sheet
title_fullStr	Preparation of Multiscale α Phase by Heat Treatments and Its Effect on Tensile Properties in Metastable β Titanium Alloy Sheet
title_full_unstemmed	Preparation of Multiscale α Phase by Heat Treatments and Its Effect on Tensile Properties in Metastable β Titanium Alloy Sheet
title_sort	preparation of multiscale α phase by heat treatments and its effect on tensile properties in metastable β titanium alloy sheet
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/63ac3050e81b42dc8dca5cb40abc6284
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Preparation of Multiscale α Phase by Heat Treatments and Its Effect on Tensile Properties in Metastable β Titanium Alloy Sheet

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