Novel Co-rich high entropy alloys with superior tensile properties

Daixiu Wei; Xiaoqing Li; Weicheng Heng; Yuichiro Koizumi; Feng He; Won Mi Choi; Byeong Joo Lee; Hyoung Seop Kim; Hidemi Kato; Akihiko Chiba

doi:10.1080/21663831.2018.1553803

Novel Co-rich high entropy alloys with superior tensile properties

Daixiu Wei, Xiaoqing Li, Weicheng Heng, Yuichiro Koizumi, Feng He, Won Mi Choi, Byeong Joo Lee, Hyoung Seop Kim, Hidemi Kato, Akihiko Chiba

材料学院

科研成果: 期刊稿件 › 文章 › 同行评审

167 引用（Scopus）

摘要

We developed a series of Co-rich Co_xCr₂₅(FeNi)_75−x (x = 35, 45, 55, 65) high entropy alloys with improved strength and/or ductility, derived from lowering the stacking fault energy (SFE) and reducing the fcc phase stability of the equiatomic CoCrFeNi alloy. Thermodynamics and ab initio calculations demonstrated that increasing Co while decreasing Fe and Ni concentrations lower the SFE and reduce the fcc phase stability. The Co₃₅Cr₂₅Fe₂₀Ni₂₀ and Co₄₅Cr₂₅Fe₁₅Ni₁₅ alloys with single fcc phase, exhibit superior tensile properties, contributing to the twinning and fcc → hcp martensitic transformation. The present study offers a guideline for designing high-performance high entropy alloys.

源语言	英语
页（从-至）	82-88
页数	7
期刊	Materials Research Letters
卷	7
期	2
DOI	https://doi.org/10.1080/21663831.2018.1553803
出版状态	已出版 - 1 2月 2019

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title = "Novel Co-rich high entropy alloys with superior tensile properties",

abstract = "We developed a series of Co-rich CoxCr25(FeNi)75−x (x = 35, 45, 55, 65) high entropy alloys with improved strength and/or ductility, derived from lowering the stacking fault energy (SFE) and reducing the fcc phase stability of the equiatomic CoCrFeNi alloy. Thermodynamics and ab initio calculations demonstrated that increasing Co while decreasing Fe and Ni concentrations lower the SFE and reduce the fcc phase stability. The Co35Cr25Fe20Ni20 and Co45Cr25Fe15Ni15 alloys with single fcc phase, exhibit superior tensile properties, contributing to the twinning and fcc → hcp martensitic transformation. The present study offers a guideline for designing high-performance high entropy alloys.",

keywords = "High entropy alloy, deformation twinning, martensitic transformation, metastable, stacking fault energy",

author = "Daixiu Wei and Xiaoqing Li and Weicheng Heng and Yuichiro Koizumi and Feng He and Choi, {Won Mi} and Lee, {Byeong Joo} and Kim, {Hyoung Seop} and Hidemi Kato and Akihiko Chiba",

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T1 - Novel Co-rich high entropy alloys with superior tensile properties

AU - Wei, Daixiu

AU - Li, Xiaoqing

AU - Heng, Weicheng

AU - Koizumi, Yuichiro

AU - He, Feng

AU - Choi, Won Mi

AU - Lee, Byeong Joo

AU - Kim, Hyoung Seop

AU - Kato, Hidemi

AU - Chiba, Akihiko

PY - 2019/2/1

Y1 - 2019/2/1

N2 - We developed a series of Co-rich CoxCr25(FeNi)75−x (x = 35, 45, 55, 65) high entropy alloys with improved strength and/or ductility, derived from lowering the stacking fault energy (SFE) and reducing the fcc phase stability of the equiatomic CoCrFeNi alloy. Thermodynamics and ab initio calculations demonstrated that increasing Co while decreasing Fe and Ni concentrations lower the SFE and reduce the fcc phase stability. The Co35Cr25Fe20Ni20 and Co45Cr25Fe15Ni15 alloys with single fcc phase, exhibit superior tensile properties, contributing to the twinning and fcc → hcp martensitic transformation. The present study offers a guideline for designing high-performance high entropy alloys.

AB - We developed a series of Co-rich CoxCr25(FeNi)75−x (x = 35, 45, 55, 65) high entropy alloys with improved strength and/or ductility, derived from lowering the stacking fault energy (SFE) and reducing the fcc phase stability of the equiatomic CoCrFeNi alloy. Thermodynamics and ab initio calculations demonstrated that increasing Co while decreasing Fe and Ni concentrations lower the SFE and reduce the fcc phase stability. The Co35Cr25Fe20Ni20 and Co45Cr25Fe15Ni15 alloys with single fcc phase, exhibit superior tensile properties, contributing to the twinning and fcc → hcp martensitic transformation. The present study offers a guideline for designing high-performance high entropy alloys.

KW - High entropy alloy

KW - deformation twinning

KW - martensitic transformation

KW - metastable

KW - stacking fault energy

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DO - 10.1080/21663831.2018.1553803

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SN - 2166-3831

VL - 7

SP - 82

EP - 88

JO - Materials Research Letters

JF - Materials Research Letters

IS - 2

ER -

Novel Co-rich high entropy alloys with superior tensile properties

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