Unusual dynamic precipitation softening induced by dislocation glide in biomedical beta-titanium alloys

Abstract Softening of metallic materials containing precipitates during cyclic deformation occurs through dissolution of the precipitates, because the to-and-fro motion of the dislocation causes dissolution of the precipitate particles by cutting them. Here, however, we found the completely opposite...

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Autores principales:	Koji Hagihara, Takayoshi Nakano, Mitsuharu Todai
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6b6b17a79fe744038a08e93de1d62be1
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spelling	oai:doaj.org-article:6b6b17a79fe744038a08e93de1d62be12021-12-02T16:08:07ZUnusual dynamic precipitation softening induced by dislocation glide in biomedical beta-titanium alloys10.1038/s41598-017-08211-72045-2322https://doaj.org/article/6b6b17a79fe744038a08e93de1d62be12017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08211-7https://doaj.org/toc/2045-2322Abstract Softening of metallic materials containing precipitates during cyclic deformation occurs through dissolution of the precipitates, because the to-and-fro motion of the dislocation causes dissolution of the precipitate particles by cutting them. Here, however, we found the completely opposite phenomenon for the first time; a “dynamic precipitation softening” phenomenon. In a Ti-35Nb-10Ta-5Zr body-centered cubic structured β-Ti alloy single crystal developed for biomedical implant, the to-and-fro motion of the dislocation “induced” the selective precipitation of the ω-phase whose c-axis is parallel to the Burgers vector of the moving dislocation, which led to the significant cyclic softening of the crystal. The formation of the ω-phase is generally believed to induce significant hardening of β-Ti alloys. However, the present results suggest that this is not always true, and control of the anisotropic features of the ω-phase via control of crystal orientation can induce unusual mechanical properties in β-Ti alloys. The unique anisotropic mechanical properties obtained by the cyclic-deformation-induced oriented ω-phase formation could be useful for the development of “single-crystalline β-Ti implant materials” with advanced mechanical performance.Koji HagiharaTakayoshi NakanoMitsuharu TodaiNature 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 Koji Hagihara Takayoshi Nakano Mitsuharu Todai Unusual dynamic precipitation softening induced by dislocation glide in biomedical beta-titanium alloys
description	Abstract Softening of metallic materials containing precipitates during cyclic deformation occurs through dissolution of the precipitates, because the to-and-fro motion of the dislocation causes dissolution of the precipitate particles by cutting them. Here, however, we found the completely opposite phenomenon for the first time; a “dynamic precipitation softening” phenomenon. In a Ti-35Nb-10Ta-5Zr body-centered cubic structured β-Ti alloy single crystal developed for biomedical implant, the to-and-fro motion of the dislocation “induced” the selective precipitation of the ω-phase whose c-axis is parallel to the Burgers vector of the moving dislocation, which led to the significant cyclic softening of the crystal. The formation of the ω-phase is generally believed to induce significant hardening of β-Ti alloys. However, the present results suggest that this is not always true, and control of the anisotropic features of the ω-phase via control of crystal orientation can induce unusual mechanical properties in β-Ti alloys. The unique anisotropic mechanical properties obtained by the cyclic-deformation-induced oriented ω-phase formation could be useful for the development of “single-crystalline β-Ti implant materials” with advanced mechanical performance.
format	article
author	Koji Hagihara Takayoshi Nakano Mitsuharu Todai
author_facet	Koji Hagihara Takayoshi Nakano Mitsuharu Todai
author_sort	Koji Hagihara
title	Unusual dynamic precipitation softening induced by dislocation glide in biomedical beta-titanium alloys
title_short	Unusual dynamic precipitation softening induced by dislocation glide in biomedical beta-titanium alloys
title_full	Unusual dynamic precipitation softening induced by dislocation glide in biomedical beta-titanium alloys
title_fullStr	Unusual dynamic precipitation softening induced by dislocation glide in biomedical beta-titanium alloys
title_full_unstemmed	Unusual dynamic precipitation softening induced by dislocation glide in biomedical beta-titanium alloys
title_sort	unusual dynamic precipitation softening induced by dislocation glide in biomedical beta-titanium alloys
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/6b6b17a79fe744038a08e93de1d62be1
work_keys_str_mv	AT kojihagihara unusualdynamicprecipitationsofteninginducedbydislocationglideinbiomedicalbetatitaniumalloys AT takayoshinakano unusualdynamicprecipitationsofteninginducedbydislocationglideinbiomedicalbetatitaniumalloys AT mitsuharutodai unusualdynamicprecipitationsofteninginducedbydislocationglideinbiomedicalbetatitaniumalloys
_version_	1718384602189398016

Unusual dynamic precipitation softening induced by dislocation glide in biomedical beta-titanium alloys

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