Room-Temperature Superplasticity in an Ultrafine-Grained Magnesium Alloy

Abstract Superplasticity, a phenomenon of high tensile elongation in polycrystalline materials, is highly effective in fabrication of complex parts by metal forming without any machining. Superplasticity typically occurs only at elevated homologous temperatures, where thermally-activated deformation...

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Autores principales:	Kaveh Edalati, Takahiro Masuda, Makoto Arita, Mitsuaki Furui, Xavier Sauvage, Zenji Horita, Ruslan Z. Valiev
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/47f4c5f683384438b75cbe6208ac5ea2
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spelling	oai:doaj.org-article:47f4c5f683384438b75cbe6208ac5ea22021-12-02T15:06:11ZRoom-Temperature Superplasticity in an Ultrafine-Grained Magnesium Alloy10.1038/s41598-017-02846-22045-2322https://doaj.org/article/47f4c5f683384438b75cbe6208ac5ea22017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02846-2https://doaj.org/toc/2045-2322Abstract Superplasticity, a phenomenon of high tensile elongation in polycrystalline materials, is highly effective in fabrication of complex parts by metal forming without any machining. Superplasticity typically occurs only at elevated homologous temperatures, where thermally-activated deformation mechanisms dominate. Here, we report the first observation of room-temperature superplasticity in a magnesium alloy, which challenges the commonly-held view of the poor room-temperature plasticity of magnesium alloys. An ultrafine-grained magnesium-lithium (Mg-8 wt.%Li) alloy produced by severe plastic deformation demonstrated 440% elongation at room temperature (0.35 T m) with a strain-rate sensitivity of 0.37. These unique properties were associated with enhanced grain-boundary sliding, which was approximately 60% of the total elongation. This enhancement originates from fast grain-boundary diffusion caused by the Li segregation along the grain boundaries and the formation of Li-rich interphases. This discovery introduces a new approach for controlling the room-temperature superplasticity by engineering grain-boundary composition and diffusion, which is of importance in metal forming technology without heating.Kaveh EdalatiTakahiro MasudaMakoto AritaMitsuaki FuruiXavier SauvageZenji HoritaRuslan Z. ValievNature 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 Kaveh Edalati Takahiro Masuda Makoto Arita Mitsuaki Furui Xavier Sauvage Zenji Horita Ruslan Z. Valiev Room-Temperature Superplasticity in an Ultrafine-Grained Magnesium Alloy
description	Abstract Superplasticity, a phenomenon of high tensile elongation in polycrystalline materials, is highly effective in fabrication of complex parts by metal forming without any machining. Superplasticity typically occurs only at elevated homologous temperatures, where thermally-activated deformation mechanisms dominate. Here, we report the first observation of room-temperature superplasticity in a magnesium alloy, which challenges the commonly-held view of the poor room-temperature plasticity of magnesium alloys. An ultrafine-grained magnesium-lithium (Mg-8 wt.%Li) alloy produced by severe plastic deformation demonstrated 440% elongation at room temperature (0.35 T m) with a strain-rate sensitivity of 0.37. These unique properties were associated with enhanced grain-boundary sliding, which was approximately 60% of the total elongation. This enhancement originates from fast grain-boundary diffusion caused by the Li segregation along the grain boundaries and the formation of Li-rich interphases. This discovery introduces a new approach for controlling the room-temperature superplasticity by engineering grain-boundary composition and diffusion, which is of importance in metal forming technology without heating.
format	article
author	Kaveh Edalati Takahiro Masuda Makoto Arita Mitsuaki Furui Xavier Sauvage Zenji Horita Ruslan Z. Valiev
author_facet	Kaveh Edalati Takahiro Masuda Makoto Arita Mitsuaki Furui Xavier Sauvage Zenji Horita Ruslan Z. Valiev
author_sort	Kaveh Edalati
title	Room-Temperature Superplasticity in an Ultrafine-Grained Magnesium Alloy
title_short	Room-Temperature Superplasticity in an Ultrafine-Grained Magnesium Alloy
title_full	Room-Temperature Superplasticity in an Ultrafine-Grained Magnesium Alloy
title_fullStr	Room-Temperature Superplasticity in an Ultrafine-Grained Magnesium Alloy
title_full_unstemmed	Room-Temperature Superplasticity in an Ultrafine-Grained Magnesium Alloy
title_sort	room-temperature superplasticity in an ultrafine-grained magnesium alloy
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/47f4c5f683384438b75cbe6208ac5ea2
work_keys_str_mv	AT kavehedalati roomtemperaturesuperplasticityinanultrafinegrainedmagnesiumalloy AT takahiromasuda roomtemperaturesuperplasticityinanultrafinegrainedmagnesiumalloy AT makotoarita roomtemperaturesuperplasticityinanultrafinegrainedmagnesiumalloy AT mitsuakifurui roomtemperaturesuperplasticityinanultrafinegrainedmagnesiumalloy AT xaviersauvage roomtemperaturesuperplasticityinanultrafinegrainedmagnesiumalloy AT zenjihorita roomtemperaturesuperplasticityinanultrafinegrainedmagnesiumalloy AT ruslanzvaliev roomtemperaturesuperplasticityinanultrafinegrainedmagnesiumalloy
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Room-Temperature Superplasticity in an Ultrafine-Grained Magnesium Alloy

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