A new insight into the phase stability in high entropy alloys

Abstract

A comparative model has been used to evaluate the phase stability of the high entropy alloys (HEAs) by using chromium equivalent (Creq) and nickel equivalent (Nieq). 296 numbers of HEAs have been chosen for the present study and the experimentally observed phases are classified as single-phase FCC, single-phase BCC, FCC+BCC, FCC+Intermetallics (IM), and BCC+IM. The alloying elements were divided into BCC stabilizers and FCC stabilizers in order to calculate Creq and Nieq, respectively. An effort has been made to evaluate the solid solution stability range of 296 numbers of HEAs in terms of Creqand Nieq to explore a larger domain in the arena of HEAs. Valence electron concentration (VEC) of the selected HEAs has been correlated with the Creq and Nieq. Moreover, Creq and Nieqhave been inter-linked with the calculated melting temperature of the HEAs.