Effects of Mutual Interaction between Constituent Elements on Phase Formation of High Entropy Alloys

Anil Kumar,Manoj Chopkar

doi:10.15744/2348-9812.5.201

Abstract

High entropy alloys (HEAs) are alloys that contains multiple elements, often five or more principal elements in equiatomic or near equiatomic ratio with or without minor elements. As felt from the name, high mixing entropy is the sole parameter to decide the solid solution alloy formation in HEAs but, the mutual interaction between elements are key parameters to predict the phase formation in HEAs as proposed by some researchers.

Highlights

After the development of bulk metallic glasses (BMGs), high entropy alloys (HEAs) emerged as an advanced metallic material
In this review the guideline for alloy design in High entropy alloys (HEAs) for the formation of solid solution phases are proposed on basis of atomic size difference (δ), mixing entropy (ΔSmix), mixing enthalpy (ΔHmix), valence electron concentration (VEC) and electronegativity difference (Δχ)
To a small extent the attention was paid to the effect of atomic size, valence electrons and electronegativity of constituent elements on HEAs, they are as the truth quite encouraging [9,10]

Summary

Introduction

After the development of bulk metallic glasses (BMGs), high entropy alloys (HEAs) emerged as an advanced metallic material. HEAs are often in single solid solution form has been attracting extensive research of materials community for their excellent properties like wear resistance, high hardness, softening resistance at higher temperature, corrosion and oxidation resistance. The alloy design concept in HEAs is beyond the realm of traditional powder metallurgy concept. The phase formation in HEAs are typically solid solution FCC and/or BCC structured which is far from intermetallic compounds formation in conventional physical metallurgy process. State of the art gives a significant idea that most studies in HEAs are focused on phase identification, microstructures, mechanical and physical properties [3,4,5,6,7,8]. To a small extent the attention was paid to the effect of atomic size, valence electrons and electronegativity of constituent elements on HEAs, they are as the truth quite encouraging [9,10]

Objectives

Discussion

Conclusion