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 language | English |
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Pages (from-to) | 694-701 |
Number of pages | 8 |
Journal | Journal of Phase Equilibria and Diffusion |
Volume | 39 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2018 Oct 1 |
Externally published | Yes |
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