Question

High entropy alloys defination based on composition

Answer 1

Answer:

Basically a high entropy alloy is an alloy with multiple elements (tipically 5 or more) that remain in solid solution instead of precipitate in several phases. As a consequence there is only one phase constituted by the solid solution, which exhibit a very high entropy of mixing. You can find the definition of the concept of entropy of mixing in clasical books, as for instance "Phase Transformations in Metals and Alloys" from D.A. Porter and K.E. Easterling.

It would take too long to describe the properties of this kind of alloys, and so I recommend to read some of the recent review on this field. I send you here attached one of these reviews. It is not the last one, but you will have enough reading for being happy several weeks.