Abstract

High Entropy Alloys (HEAs) have been emerged as conceptually innovative alloys that defied the conventional alloying concepts. The concept of HEAs is based on designing the alloys with multiple principal elements ranging from 5 to 35 atomic percent with a target to form single phase solid solution arising from high entropy of the system. The initial development of HEAs was based on the high density principal elements. Recently, low density elements such as Mg, Al, Li, Si and Ca were used to develop light weight high entropy alloy (LWHEA) systems to address the issues related to greenhouse gas emissions. LWHEAs with equiatomic and non-equiatomic compositions were developed successfully. However, single phase solid solution was seldom formed in LWHEAs. In view of current development on LWHEAs, chemical compositions, microstructure and mechanical properties are reviewed and presented in this study.