Extremely high strength and work hardening ability in a metastable high entropy alloy

Extremely high strength and work hardening ability in a metastable high entropy alloy

Abstract Design of multi-phase high entropy alloys uses metastability of phases to tune the strain accommodation by favoring transformation and/or twinning during deformation. Inspired by this, here we present Si containing dual phase Fe42Mn28Co10Cr15Si5 high entropy alloy (DP-5Si-HEA) exhibiting ve...

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Main Authors: S. S. Nene, M. Frank, K. Liu, R. S. Mishra, B. A. McWilliams, K. C. Cho
Format: Article
Language:English
Published: Nature Publishing Group 2018-07-01
Series:Scientific Reports
Online Access:https://doi.org/10.1038/s41598-018-28383-0
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spelling doaj-197a4fc27a874c92bd8354146922863b2020-12-08T05:07:59ZengNature Publishing GroupScientific Reports2045-23222018-07-01811810.1038/s41598-018-28383-0Extremely high strength and work hardening ability in a metastable high entropy alloyS. S. Nene0M. Frank1K. Liu2R. S. Mishra3B. A. McWilliams4K. C. Cho5Center for Friction Stir Processing, Department of Materials Science and Engineering, University of North TexasCenter for Friction Stir Processing, Department of Materials Science and Engineering, University of North TexasCenter for Friction Stir Processing, Department of Materials Science and Engineering, University of North TexasCenter for Friction Stir Processing, Department of Materials Science and Engineering, University of North TexasWeapons and Materials Research Directorate, U.S. Army Research LaboratoryWeapons and Materials Research Directorate, U.S. Army Research LaboratoryAbstract Design of multi-phase high entropy alloys uses metastability of phases to tune the strain accommodation by favoring transformation and/or twinning during deformation. Inspired by this, here we present Si containing dual phase Fe42Mn28Co10Cr15Si5 high entropy alloy (DP-5Si-HEA) exhibiting very high strength (1.15 GPa) and work hardening (WH) ability. The addition of Si in DP-5Si-HEA decreased the stability of f.c.c. (γ) matrix thereby promoting pronounced transformation induced plastic deformation in both as-cast and grain refined DP-5Si-HEAs. Higher yet sustained WH ability in fine grained DP-5Si-HEA is associated with the uniform strain partitioning among the metastable γ phase and resultant h.c.p. (ε) phase thereby resulting in total elongation of 12%. Hence, design of dual phase HEAs for improved strength and work hardenability can be attained by tuning the metastability of γ matrix through proper choice of alloy chemistry from the abundant compositional space of HEAs.https://doi.org/10.1038/s41598-018-28383-0
collection DOAJ
language English
format Article
sources DOAJ
author S. S. Nene
M. Frank
K. Liu
R. S. Mishra
B. A. McWilliams
K. C. Cho
spellingShingle S. S. Nene
M. Frank
K. Liu
R. S. Mishra
B. A. McWilliams
K. C. Cho
Extremely high strength and work hardening ability in a metastable high entropy alloy
Scientific Reports
author_facet S. S. Nene
M. Frank
K. Liu
R. S. Mishra
B. A. McWilliams
K. C. Cho
author_sort S. S. Nene
title Extremely high strength and work hardening ability in a metastable high entropy alloy
title_short Extremely high strength and work hardening ability in a metastable high entropy alloy
title_full Extremely high strength and work hardening ability in a metastable high entropy alloy
title_fullStr Extremely high strength and work hardening ability in a metastable high entropy alloy
title_full_unstemmed Extremely high strength and work hardening ability in a metastable high entropy alloy
title_sort extremely high strength and work hardening ability in a metastable high entropy alloy
publisher Nature Publishing Group
series Scientific Reports
issn 2045-2322
publishDate 2018-07-01
description Abstract Design of multi-phase high entropy alloys uses metastability of phases to tune the strain accommodation by favoring transformation and/or twinning during deformation. Inspired by this, here we present Si containing dual phase Fe42Mn28Co10Cr15Si5 high entropy alloy (DP-5Si-HEA) exhibiting very high strength (1.15 GPa) and work hardening (WH) ability. The addition of Si in DP-5Si-HEA decreased the stability of f.c.c. (γ) matrix thereby promoting pronounced transformation induced plastic deformation in both as-cast and grain refined DP-5Si-HEAs. Higher yet sustained WH ability in fine grained DP-5Si-HEA is associated with the uniform strain partitioning among the metastable γ phase and resultant h.c.p. (ε) phase thereby resulting in total elongation of 12%. Hence, design of dual phase HEAs for improved strength and work hardenability can be attained by tuning the metastability of γ matrix through proper choice of alloy chemistry from the abundant compositional space of HEAs.
url https://doi.org/10.1038/s41598-018-28383-0
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