Co-introduction of precipitate hardening and TRIP in a TWIP high-entropy alloy using friction stir alloying

Abstract Tuning deformation mechanisms is imperative to overcome the well-known strength-ductility paradigm. Twinning-induced plasticity (TWIP), transformation-induced plasticity (TRIP) and precipitate hardening have been investigated separately and have been altered to achieve exceptional strength...

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Autores principales:	Tianhao Wang, Shivakant Shukla, Bharat Gwalani, Subhasis Sinha, Saket Thapliyal, Michael Frank, Rajiv S. Mishra
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5bfdc744a87a4dc98d033c299ce56d7d
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spelling	oai:doaj.org-article:5bfdc744a87a4dc98d033c299ce56d7d2021-12-02T15:23:10ZCo-introduction of precipitate hardening and TRIP in a TWIP high-entropy alloy using friction stir alloying10.1038/s41598-021-81350-02045-2322https://doaj.org/article/5bfdc744a87a4dc98d033c299ce56d7d2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-81350-0https://doaj.org/toc/2045-2322Abstract Tuning deformation mechanisms is imperative to overcome the well-known strength-ductility paradigm. Twinning-induced plasticity (TWIP), transformation-induced plasticity (TRIP) and precipitate hardening have been investigated separately and have been altered to achieve exceptional strength or ductility in several alloy systems. In this study, we use a novel solid-state alloying method—friction stir alloying (FSA)—to tune the microstructure, and a composition of a TWIP high-entropy alloy by adding Ti, and thus activating site-specific deformation mechanisms that occur concomitantly in a single alloy. During the FSA process, grains of the as-cast face-centered cubic matrix were refined by high-temperature severe plastic deformation and, subsequently, a new alloy composition was obtained by dissolving Ti into the matrix. After annealing the FSA specimen at 900 °C, hard Ni–Ti rich precipitates formed to strengthen the alloy. An additional result was a Ni-depleted region in the vicinity of newly-formed precipitates. The reduction in Ni locally reduced the stacking fault energy, thus inducing TRIP-based deformation while the remaining matrix still deformed as a result of TWIP. Our current approach presents a novel microstructural architecture to design alloys, an approach that combines and optimizes local compositions such that multiple deformation mechanisms can be activated to enhance engineering properties.Tianhao WangShivakant ShuklaBharat GwalaniSubhasis SinhaSaket ThapliyalMichael FrankRajiv S. MishraNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Tianhao Wang Shivakant Shukla Bharat Gwalani Subhasis Sinha Saket Thapliyal Michael Frank Rajiv S. Mishra Co-introduction of precipitate hardening and TRIP in a TWIP high-entropy alloy using friction stir alloying
description	Abstract Tuning deformation mechanisms is imperative to overcome the well-known strength-ductility paradigm. Twinning-induced plasticity (TWIP), transformation-induced plasticity (TRIP) and precipitate hardening have been investigated separately and have been altered to achieve exceptional strength or ductility in several alloy systems. In this study, we use a novel solid-state alloying method—friction stir alloying (FSA)—to tune the microstructure, and a composition of a TWIP high-entropy alloy by adding Ti, and thus activating site-specific deformation mechanisms that occur concomitantly in a single alloy. During the FSA process, grains of the as-cast face-centered cubic matrix were refined by high-temperature severe plastic deformation and, subsequently, a new alloy composition was obtained by dissolving Ti into the matrix. After annealing the FSA specimen at 900 °C, hard Ni–Ti rich precipitates formed to strengthen the alloy. An additional result was a Ni-depleted region in the vicinity of newly-formed precipitates. The reduction in Ni locally reduced the stacking fault energy, thus inducing TRIP-based deformation while the remaining matrix still deformed as a result of TWIP. Our current approach presents a novel microstructural architecture to design alloys, an approach that combines and optimizes local compositions such that multiple deformation mechanisms can be activated to enhance engineering properties.
format	article
author	Tianhao Wang Shivakant Shukla Bharat Gwalani Subhasis Sinha Saket Thapliyal Michael Frank Rajiv S. Mishra
author_facet	Tianhao Wang Shivakant Shukla Bharat Gwalani Subhasis Sinha Saket Thapliyal Michael Frank Rajiv S. Mishra
author_sort	Tianhao Wang
title	Co-introduction of precipitate hardening and TRIP in a TWIP high-entropy alloy using friction stir alloying
title_short	Co-introduction of precipitate hardening and TRIP in a TWIP high-entropy alloy using friction stir alloying
title_full	Co-introduction of precipitate hardening and TRIP in a TWIP high-entropy alloy using friction stir alloying
title_fullStr	Co-introduction of precipitate hardening and TRIP in a TWIP high-entropy alloy using friction stir alloying
title_full_unstemmed	Co-introduction of precipitate hardening and TRIP in a TWIP high-entropy alloy using friction stir alloying
title_sort	co-introduction of precipitate hardening and trip in a twip high-entropy alloy using friction stir alloying
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/5bfdc744a87a4dc98d033c299ce56d7d
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Co-introduction of precipitate hardening and TRIP in a TWIP high-entropy alloy using friction stir alloying

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