High-Entropy Alloy (HEA)

Last Updated: April 6, 2020

Definition - What does High-Entropy Alloy (HEA) mean?

A high-entropy alloy (HEA) is a metal alloy whose composition consists of significant proportions of five or more metallic elements. HEAs are a subset of multi-principal metal alloys (MPEAs), which are metal alloys that contain two or more primary elements. Like MPEAs, HEAs are renowned for their superior physical and mechanical properties compared to conventional alloys.

Corrosionpedia explains High-Entropy Alloy (HEA)

A conventional alloy consists of mainly one principal element with smaller amounts of other elements to improve its characteristics. While as many as a dozen additional elements may be included in a conventional alloy, one base element possesses the majority atom fraction in the material.

High-entropy alloys, on the other hand, contain five or more metallic elements in relatively large proportions. As a result, they usually have properties that exceed those of conventional alloys, such as enhanced hardness, durability, corrosion resistance, thermal stability and wear resistance.

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