Novel Co-rich high performance twinning-induced plasticity (TWIP) and transformation-induced plasticity (TRIP) high-entropy alloys

The equiatomic CoCrMnNiFe high-entropy alloy (HEA) has attracted much attention owing to its exceptional mechanical properties. Here, we designed novel face-centered cubic (fcc) phase Co-rich non-equiatomic CoCrMnNiFe HEAs with tensile properties superior to the counterparts, derived from lowering s...

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Bibliographic Details
Published inScripta materialia Vol. 165; pp. 39 - 43
Main Authors Wei, Daixiu, Li, Xiaoqing, Jiang, Jing, Heng, Weicheng, Koizumi, Yuichiro, Choi, Won-Mi, Lee, Byeong-Joo, Kim, Hyoung Seop, Kato, Hidemi, Chiba, Akihiko
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.05.2019
Subjects
Deformation twinning
High-entropy alloy
Martensitic transformation
Phase stability
Stacking fault energy
Stacking fault energy
Deformation twinning
Martensitic transformation
Phase stability
High-entropy alloy
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Summary:The equiatomic CoCrMnNiFe high-entropy alloy (HEA) has attracted much attention owing to its exceptional mechanical properties. Here, we designed novel face-centered cubic (fcc) phase Co-rich non-equiatomic CoCrMnNiFe HEAs with tensile properties superior to the counterparts, derived from lowering stacking fault energy (SFE) via modifying constituent concentrations. The decrease of Mn, Ni, Fe meanwhile increase of Co, Cr concentrations does reduce the SFE value, based on ab initio and thermodynamics calculations. Hereinto, Co35Cr20Mn15Ni15Fe15 and Co35Cr25Mn15Ni15Fe10 HEAs overcame the strength-ductility trade-off, contributing to twinning-induced plasticity (TWIP) or transformation-induced plasticity (TRIP) effects, respectively. The present study sheds light on developing high performance HEAs. [Display omitted]
ISSN:1359-6462
1872-8456
1872-8456
DOI:10.1016/j.scriptamat.2019.02.018