A Study on Compositional Approach to Designing FCC High-Entropy Alloys that Have an Enlarged Equiaxed Zone

A compositional approach to designing alloys that have an enlarged equiaxed zone is suggested in
this study. The partitioning of elements during the solidification of CoCrFeMnNi high-entropy alloy
(HEA) was confirmed through a directional solidification quenching experiment. Several HEAs were
designed to maximize the effects of constitutional and thermal undercooling by considering factors
including solute enrichment at the columnar front and the melting temperatures and thermal
conductivities of the individual elements. The newly designed HEAs were shown to have successfully
enlarged equiaxed zones and improved anisotropic properties. The enlarged equiaxed zone
contributes to the moderated anisotropy of the pilot-scale V15 HEA. This approach to alloy design
could support the development of new HEA castings containing high proportions of equiaxed zone.