Why High-Entropy Alloys are called High-Entropy

High-Entropy Alloys (High-Entropy Alloys) referred to as HEAs, is composed of five or more major elements, and the atomic fraction of each major element >5% and <35%.

New Concept of Material Alloying-High Entropy Alloys (Nano High Entropy Alloys, Multi-High Entropy Alloys) At the end of the 20th century, traditional alloys are close to maturity and saturation, and the traditional concept of alloying has made it difficult to create new alloying systems or new alloys in the old alloying systems.

But the concept of nano-high entropy alloys can generate many alloy systems with many interesting properties. The so-called poly (nano) high entropy alloys are multi-element alloys in which each major element has a high atomic percentage, which has been defined as a high entropy alloy in which the number of major elements is greater than or equal to 5, but none of them has an atomic percentage greater than 35%.

That is to say, high-entropy alloys do not contain a major element with more than 50 percent of the total number of atoms, unlike conventional alloys.