Cr-Mo-V-W: A new refractory and transition metal high-entropy alloy system

Abstract

Abstract Cr-Mo-V-W high-entropy alloy (HEA) is studied, with 2553\u202fK equilibrium solidus and high Cr content to promote protective oxide scale formation, suggesting potential applications in hot, oxidising environments. Alloy Search and Predict (ASAP) and phase diagram calculations found a single phase, body-centred cubic (BCC) solid solution at elevated temperatures, across the range of compositions present within the system - uncommon for a HEA of refractory and transition metals. Density functional theory identified solubility of 22\u202fat.% Cr at solidus temperature, with composition-dependent drive for segregation during cooling. An as-cast, BCC single-phase with the composition 31.3Cr-23.6Mo-26.4\u202fV-18.7\u202fW exhibiting dendritic microsegregation was verified.