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

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)82-88
Number of pages7
JournalMaterials Research Letters
Volume7
Issue number2
DOIs
Publication statusPublished - 2019 Feb 1

Keywords

  • High entropy alloy
  • deformation twinning
  • martensitic transformation
  • metastable
  • stacking fault energy

ASJC Scopus subject areas

  • Materials Science(all)

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