Microstructure and composition dependence of mechanical characteristics of nanoimprinted AlCoCrFeNi high-entropy alloys

Abstract Molecular dynamics is applied to explore the deformation mechanism and crystal structure development of the AlCoCrFeNi high-entropy alloys under nanoimprinting. The influences of crystal structure, alloy composition, grain size, and twin boundary distance on the mechanical properties are ca...

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Autores principales:	Dinh-Quan Doan, Te-Hua Fang, Tao-Hsing Chen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/7907ed745e9f4f5593958d097ded1030
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spelling	oai:doaj.org-article:7907ed745e9f4f5593958d097ded10302021-12-02T16:32:02ZMicrostructure and composition dependence of mechanical characteristics of nanoimprinted AlCoCrFeNi high-entropy alloys10.1038/s41598-021-93272-y2045-2322https://doaj.org/article/7907ed745e9f4f5593958d097ded10302021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-93272-yhttps://doaj.org/toc/2045-2322Abstract Molecular dynamics is applied to explore the deformation mechanism and crystal structure development of the AlCoCrFeNi high-entropy alloys under nanoimprinting. The influences of crystal structure, alloy composition, grain size, and twin boundary distance on the mechanical properties are carefully analyzed. The imprinting load indicates that the highest loading force is in ascending order with polycrystalline, nano-twinned (NT) polycrystalline, and monocrystalline. The change in alloy composition suggests that the imprinting force increases as the Al content in the alloy increases. The reverse Hall–Petch relation found for the polycrystalline structure, while the Hall–Petch and reverse Hall–Petch relations are discovered in the NT-polycrystalline, which is due to the interactions between the dislocations and grain/twin boundaries (GBs/TBs). The deformation behavior shows that shear strain and local stress are concentrated not only around the punch but also on GBs and adjacent to GBs. The slide and twist of the GBs play a major in controlling the deformation mechanism of polycrystalline structure. The twin boundary migrations are detected during the nanoimprinting of the NT-polycrystalline. Furthermore, the elastic recovery of material is insensitive to changes in alloy composition and grain size, and the formability of the pattern is higher with a decrease in TB distance.Dinh-Quan DoanTe-Hua FangTao-Hsing ChenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-19 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Dinh-Quan Doan Te-Hua Fang Tao-Hsing Chen Microstructure and composition dependence of mechanical characteristics of nanoimprinted AlCoCrFeNi high-entropy alloys
description	Abstract Molecular dynamics is applied to explore the deformation mechanism and crystal structure development of the AlCoCrFeNi high-entropy alloys under nanoimprinting. The influences of crystal structure, alloy composition, grain size, and twin boundary distance on the mechanical properties are carefully analyzed. The imprinting load indicates that the highest loading force is in ascending order with polycrystalline, nano-twinned (NT) polycrystalline, and monocrystalline. The change in alloy composition suggests that the imprinting force increases as the Al content in the alloy increases. The reverse Hall–Petch relation found for the polycrystalline structure, while the Hall–Petch and reverse Hall–Petch relations are discovered in the NT-polycrystalline, which is due to the interactions between the dislocations and grain/twin boundaries (GBs/TBs). The deformation behavior shows that shear strain and local stress are concentrated not only around the punch but also on GBs and adjacent to GBs. The slide and twist of the GBs play a major in controlling the deformation mechanism of polycrystalline structure. The twin boundary migrations are detected during the nanoimprinting of the NT-polycrystalline. Furthermore, the elastic recovery of material is insensitive to changes in alloy composition and grain size, and the formability of the pattern is higher with a decrease in TB distance.
format	article
author	Dinh-Quan Doan Te-Hua Fang Tao-Hsing Chen
author_facet	Dinh-Quan Doan Te-Hua Fang Tao-Hsing Chen
author_sort	Dinh-Quan Doan
title	Microstructure and composition dependence of mechanical characteristics of nanoimprinted AlCoCrFeNi high-entropy alloys
title_short	Microstructure and composition dependence of mechanical characteristics of nanoimprinted AlCoCrFeNi high-entropy alloys
title_full	Microstructure and composition dependence of mechanical characteristics of nanoimprinted AlCoCrFeNi high-entropy alloys
title_fullStr	Microstructure and composition dependence of mechanical characteristics of nanoimprinted AlCoCrFeNi high-entropy alloys
title_full_unstemmed	Microstructure and composition dependence of mechanical characteristics of nanoimprinted AlCoCrFeNi high-entropy alloys
title_sort	microstructure and composition dependence of mechanical characteristics of nanoimprinted alcocrfeni high-entropy alloys
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/7907ed745e9f4f5593958d097ded1030
work_keys_str_mv	AT dinhquandoan microstructureandcompositiondependenceofmechanicalcharacteristicsofnanoimprintedalcocrfenihighentropyalloys AT tehuafang microstructureandcompositiondependenceofmechanicalcharacteristicsofnanoimprintedalcocrfenihighentropyalloys AT taohsingchen microstructureandcompositiondependenceofmechanicalcharacteristicsofnanoimprintedalcocrfenihighentropyalloys
_version_	1718383818432315392

Microstructure and composition dependence of mechanical characteristics of nanoimprinted AlCoCrFeNi high-entropy alloys

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