A thermodynamic description of the Co-Cr-Fe-Ni-V system for high-entropy alloy design

Won Mi Choi, Yong Hee Jo, Dong Geun Kim, Seok S Sohn, Sunghak Lee, Byeong Joo Lee

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

To increase the strength of representative equiatomic CoCrFeMnNi HEAs (high entropy alloys), many researchers have attempted to generate a secondary phase or to maximize solid-solution hardening effects. The addition of vanadium (V) could be an effective way to achieve both effects because V is a strong sigma (σ) and body-centered cubic (bcc) phase stabilizer and has a relatively large atomic size. The amount of secondary phase material formed is directly related to mechanical properties. Therefore, the ability to predict phase equilibria could guide decisions about V-added HEA design. Although the CALculation of PHAse Diagram (CALPHAD) approach can be an effective tool for predicting the phase equilibria, a thermodynamic database is still required. Therefore, the present paper aims to provide a thermodynamic description of the Co-Cr-Fe-Ni-V HEA system by developing thermodynamic descriptions of the Co-Cr-Fe, Co-Cr-V, Co-Fe-V, and Co-Ni-V systems. The reliability of the thermodynamic description developed for the Co-Cr-Fe-Ni-V quinary system is experimentally confirmed using newly designed Co-Cr-Fe-Ni-V HEAs.

Original languageEnglish
Article number101624
JournalCalphad: Computer Coupling of Phase Diagrams and Thermochemistry
Volume66
DOIs
Publication statusPublished - 2019 Sep 1

Keywords

  • CALPHAD
  • Co-Cr-Fe-Ni-V
  • High-entropy alloy
  • Thermodynamic modelling

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Computer Science Applications

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