Tensile deformation behavior of twist grain boundaries in CoCrFeMnNi high entropy alloy bicrystals

Abstract High entropy alloys (HEA) are a class of materials that consist of multiple elemental species in similar concentrations. The use of elements in far from dilute concentrations introduces a multi-dimensional composition design space by which the properties of metallic systems can be tailored....

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Hyunsoo Lee, Mitra Shabani, Garrett J. Pataky, Fadi Abdeljawad
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/09c8bf79ed6c4f3395c5e2a244a406d5
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:09c8bf79ed6c4f3395c5e2a244a406d5
record_format	dspace
spelling	oai:doaj.org-article:09c8bf79ed6c4f3395c5e2a244a406d52021-12-02T14:01:37ZTensile deformation behavior of twist grain boundaries in CoCrFeMnNi high entropy alloy bicrystals10.1038/s41598-020-77487-z2045-2322https://doaj.org/article/09c8bf79ed6c4f3395c5e2a244a406d52021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-77487-zhttps://doaj.org/toc/2045-2322Abstract High entropy alloys (HEA) are a class of materials that consist of multiple elemental species in similar concentrations. The use of elements in far from dilute concentrations introduces a multi-dimensional composition design space by which the properties of metallic systems can be tailored. While the mechanical behavior of HEAs has been the subject of active research recently, the role of grain boundaries (GBs) in their deformation behavior remains poorly understood. Motivated by recent experiments on HEAs demonstrating that GBs act as nucleation sites for deformation twins, herein, we leverage atomistic simulations to construct a series of equiatomic CoCrFeMnNi HEA bicrystals with $$\langle 110 \rangle$$ ⟨ 110 ⟩ and $$\langle 111 \rangle$$ ⟨ 111 ⟩ symmetric twist GBs and examine their tensile behavior and underlying deformation mechanisms at 77 K. Simulation results reveal that plastic deformation proceeds by the nucleation of partial dislocations from GBs, which then grow with further loading by bowing into the bulk crystals leaving behind stacking faults. Variations in the nucleation stress exist as function of GB character, defined in this work by the twist angle. Our results provide future avenues to explore GBs as a microstructure design tool to develop HEAs with tailored properties.Hyunsoo LeeMitra ShabaniGarrett J. PatakyFadi AbdeljawadNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hyunsoo Lee Mitra Shabani Garrett J. Pataky Fadi Abdeljawad Tensile deformation behavior of twist grain boundaries in CoCrFeMnNi high entropy alloy bicrystals
description	Abstract High entropy alloys (HEA) are a class of materials that consist of multiple elemental species in similar concentrations. The use of elements in far from dilute concentrations introduces a multi-dimensional composition design space by which the properties of metallic systems can be tailored. While the mechanical behavior of HEAs has been the subject of active research recently, the role of grain boundaries (GBs) in their deformation behavior remains poorly understood. Motivated by recent experiments on HEAs demonstrating that GBs act as nucleation sites for deformation twins, herein, we leverage atomistic simulations to construct a series of equiatomic CoCrFeMnNi HEA bicrystals with $$\langle 110 \rangle$$ ⟨ 110 ⟩ and $$\langle 111 \rangle$$ ⟨ 111 ⟩ symmetric twist GBs and examine their tensile behavior and underlying deformation mechanisms at 77 K. Simulation results reveal that plastic deformation proceeds by the nucleation of partial dislocations from GBs, which then grow with further loading by bowing into the bulk crystals leaving behind stacking faults. Variations in the nucleation stress exist as function of GB character, defined in this work by the twist angle. Our results provide future avenues to explore GBs as a microstructure design tool to develop HEAs with tailored properties.
format	article
author	Hyunsoo Lee Mitra Shabani Garrett J. Pataky Fadi Abdeljawad
author_facet	Hyunsoo Lee Mitra Shabani Garrett J. Pataky Fadi Abdeljawad
author_sort	Hyunsoo Lee
title	Tensile deformation behavior of twist grain boundaries in CoCrFeMnNi high entropy alloy bicrystals
title_short	Tensile deformation behavior of twist grain boundaries in CoCrFeMnNi high entropy alloy bicrystals
title_full	Tensile deformation behavior of twist grain boundaries in CoCrFeMnNi high entropy alloy bicrystals
title_fullStr	Tensile deformation behavior of twist grain boundaries in CoCrFeMnNi high entropy alloy bicrystals
title_full_unstemmed	Tensile deformation behavior of twist grain boundaries in CoCrFeMnNi high entropy alloy bicrystals
title_sort	tensile deformation behavior of twist grain boundaries in cocrfemnni high entropy alloy bicrystals
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/09c8bf79ed6c4f3395c5e2a244a406d5
work_keys_str_mv	AT hyunsoolee tensiledeformationbehavioroftwistgrainboundariesincocrfemnnihighentropyalloybicrystals AT mitrashabani tensiledeformationbehavioroftwistgrainboundariesincocrfemnnihighentropyalloybicrystals AT garrettjpataky tensiledeformationbehavioroftwistgrainboundariesincocrfemnnihighentropyalloybicrystals AT fadiabdeljawad tensiledeformationbehavioroftwistgrainboundariesincocrfemnnihighentropyalloybicrystals
_version_	1718392121885458432

Tensile deformation behavior of twist grain boundaries in CoCrFeMnNi high entropy alloy bicrystals

Ejemplares similares