High-entropy alloys (HEAs) are alloys that are formed by mixing equal or relatively large proportions of (usually) 5 or more elements. Prior to the synthesis of these substances, typical metal alloys comprised 1 or 3 major components with smaller amounts of other elements. For example, additional elements can be added to iron to improve its properties, thereby creating an iron-based alloy, but typically in fairly low proportions, such as the proportions of carbon, manganese, and others in various steels. Hence, high-entropy alloys are a novel class of materials.

These alloys are currently the focus of significant attention in materials science and engineering because they have potentially desirable properties. Some HEAs have considerably better strength-to-weight ratios, with a higher degree of fracture resistance, tensile strength, and corrosion and oxidation resistance than conventional alloys

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