A Thermodynamic Modelling of the Stability of Sigma Phase in the Cr-Fe-Ni-V High-Entropy Alloy System

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

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

The addition of vanadium (V) to the representative Co-Cr-Fe-Mn-Ni high-entropy alloy (HEA) system is attracting attention expecting a large solid solution hardening effect. For the design of V-added HEAs, prediction of the sigma (σ) phase formation has been mainly issued because it affects a significant influence on the mechanical properties. Although the CALculation of PHAse Diagram (CALPHAD) approach can be a good tool for prediction of phase structures, robust thermodynamic database is still required for an accurate prediction of V-added HEA systems. The present work aims at providing a thermodynamic description for the Cr-Fe-Ni-V HEA system, focusing on the thermodynamic stability of the σ phase. A parameterization technique which minimizes the number of fitting parameter and simplifies the extension into higher-order systems is proposed and applied to the σ phase with multiple sublattice during modelling the Cr-Ni-V and Fe-Ni-V systems. The reliability of the developed thermodynamic description for the Cr-Fe-Ni-V quaternary system is experimentally confirmed by designing, fabricating and analysing the phase structures of a series of Cr-Fe-Ni-V HEAs.

Original languageEnglish
Pages (from-to)694-701
Number of pages8
JournalJournal of Phase Equilibria and Diffusion
Volume39
Issue number5
DOIs
Publication statusPublished - 2018 Oct 1
Externally publishedYes

Bibliographical note

Funding Information:
This research was supported by the Future Material Discovery Program of the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT of Korea (2016M3D1A1023383). This invited article is part of a special issue of the Journal of Phase Equilibria and Diffusion in honor of Prof. Zhanpeng Jin’s 80th birthday. The special issue was organized by Prof. Ji-Cheng (JC) Zhao, The Ohio State University; Dr. Qing Chen, Thermo-Calc Software AB; and Prof. Yong Du, Central South University.

Funding Information:
Acknowledgments This research was supported by the Future Material Discovery Program of the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT of Korea (2016M3D1A1023383).

Publisher Copyright:
© 2018, ASM International.

Keywords

  • CALPHAD
  • Cr-Fe-Ni-V
  • high-entropy alloy
  • sigma phase
  • thermodynamic modelling

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys
  • Materials Chemistry

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