Transition from poor ductility to room-temperature superplasticity in a nanostructured aluminum alloy

Abstract Recent developments of nanostructured materials with grain sizes in the nanometer to submicrometer range have provided ground for numerous functional properties and new applications. However, in terms of mechanical properties, bulk nanostructured materials typically show poor ductility desp...

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Autores principales:	Kaveh Edalati, Zenji Horita, Ruslan Z. Valiev
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/2bf18ddd6c7943ce858c3c918ce19fb2
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spelling	oai:doaj.org-article:2bf18ddd6c7943ce858c3c918ce19fb22021-12-02T15:09:12ZTransition from poor ductility to room-temperature superplasticity in a nanostructured aluminum alloy10.1038/s41598-018-25140-12045-2322https://doaj.org/article/2bf18ddd6c7943ce858c3c918ce19fb22018-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-25140-1https://doaj.org/toc/2045-2322Abstract Recent developments of nanostructured materials with grain sizes in the nanometer to submicrometer range have provided ground for numerous functional properties and new applications. However, in terms of mechanical properties, bulk nanostructured materials typically show poor ductility despite their high strength, which limits their use for structural applications. The present article shows that the poor ductility of nanostructured alloys can be changed to room-temperature superplastisity by a transition in the deformation mechanism from dislocation activity to grain-boundary sliding. We report the first observation of room-temperature superplasticity (over 400% tensile elongations) in a nanostructured Al alloy by enhanced grain-boundary sliding. The room-temperature grain-boundary sliding and superplasticity was realized by engineering the Zn segregation along the Al/Al boundaries through severe plastic deformation. This work introduces a new boundary-based strategy to improve the mechanical properties of nanostructured materials for structural applications, where high deformability is a requirement.Kaveh EdalatiZenji HoritaRuslan Z. ValievNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-8 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Kaveh Edalati Zenji Horita Ruslan Z. Valiev Transition from poor ductility to room-temperature superplasticity in a nanostructured aluminum alloy
description	Abstract Recent developments of nanostructured materials with grain sizes in the nanometer to submicrometer range have provided ground for numerous functional properties and new applications. However, in terms of mechanical properties, bulk nanostructured materials typically show poor ductility despite their high strength, which limits their use for structural applications. The present article shows that the poor ductility of nanostructured alloys can be changed to room-temperature superplastisity by a transition in the deformation mechanism from dislocation activity to grain-boundary sliding. We report the first observation of room-temperature superplasticity (over 400% tensile elongations) in a nanostructured Al alloy by enhanced grain-boundary sliding. The room-temperature grain-boundary sliding and superplasticity was realized by engineering the Zn segregation along the Al/Al boundaries through severe plastic deformation. This work introduces a new boundary-based strategy to improve the mechanical properties of nanostructured materials for structural applications, where high deformability is a requirement.
format	article
author	Kaveh Edalati Zenji Horita Ruslan Z. Valiev
author_facet	Kaveh Edalati Zenji Horita Ruslan Z. Valiev
author_sort	Kaveh Edalati
title	Transition from poor ductility to room-temperature superplasticity in a nanostructured aluminum alloy
title_short	Transition from poor ductility to room-temperature superplasticity in a nanostructured aluminum alloy
title_full	Transition from poor ductility to room-temperature superplasticity in a nanostructured aluminum alloy
title_fullStr	Transition from poor ductility to room-temperature superplasticity in a nanostructured aluminum alloy
title_full_unstemmed	Transition from poor ductility to room-temperature superplasticity in a nanostructured aluminum alloy
title_sort	transition from poor ductility to room-temperature superplasticity in a nanostructured aluminum alloy
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/2bf18ddd6c7943ce858c3c918ce19fb2
work_keys_str_mv	AT kavehedalati transitionfrompoorductilitytoroomtemperaturesuperplasticityinananostructuredaluminumalloy AT zenjihorita transitionfrompoorductilitytoroomtemperaturesuperplasticityinananostructuredaluminumalloy AT ruslanzvaliev transitionfrompoorductilitytoroomtemperaturesuperplasticityinananostructuredaluminumalloy
_version_	1718387863876272128

Transition from poor ductility to room-temperature superplasticity in a nanostructured aluminum alloy

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