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High entropy alloys (HEAs) are alloys that contains multiple elements, often five or more principal elements in equiatomic or near equiatomic ratio with or without minor elements. As felt from the name, high mixing entropy is the sole parameter to decide the solid solution alloy formation in HEAs but, the mutual interaction between elements are key parameters to predict the phase formation in HEAs as proposed by some researchers. In this review the guideline for alloy design in HEAs for the formation of solid solution phases are proposed on basis of atomic size difference (δ), mixing entropy (ΔSmix), mixing enthalpy (ΔHmix), valence electron concentration (VEC) and electronegativity difference (Δχ). Effect of one more parameter Ω is also discussed. Ω is a parameter of the entropy of mixing timing and the average melting temperature of the elements over the enthalpy of mixing. Solid solution phase forms only when the requirement of these parameters are all met. These parametric constraints will lend a valuable motivation for future developments in HEAs.

Effects of Mutual Interaction between Constituent Elements on Phase Formation of High Entropy Alloys