A brief discussion on High-entropy alloys vs Compositionally Complex alloys

Abstract

High-entropy alloys(HEAs) are of great interest in the field of materials science and engineering. Unlike conventional alloys, which contain a maximum of 2 base metals, this new category of materials consists of multi-principle elements and the possible number of alloy compositions, in case of HEAs, is outstandingly higher than that for conventional alloys. Here, a review on the high-entropy alloys, has been provided, on the issue whether the earliest definition of High- Entropy alloys, proposed in 2004[2, 4], is consistent with one of the 4-component equiatomic Compositionally complex alloys exhibiting a “High-entropy” effect.