Fabrication and characterization of eutectic high entropy alloys

Abstract

High entropy alloys (HEA) are a new class of metals that have proven the ability to outperform traditional alloy systems in terms of physical and mechanical qualities. However, HEAs can have either high strength or high ductility, and achieving both at the same time is still a difficult task. HEA’s poor castability and compositional segregation are further impediments to their technological applicability. To address these issues, we presented a technique for designing HEAs based on the eutectic alloy idea. Due to the fine distribution of phases, the development of eutectic microstructure in high entropy alloys can aid in getting an even better combination of mechanical qualities. Using the above-mentioned concept, we designed Al5(VCr)46.36(CoNi)48.64 eutectic high entropy alloy but it did not form eutectic. One possible explanation for this could be the Al content. We need to vary the Al content lower than 5 at% and more than 5 at% systematically to see the eutectic morphology. The DSC too further evidence that there is a large region of melting indicating multiple phases, when observed in SEM micrograph, able to guess that it is a primary FCC followed by some solid-state transformation as indicated by the continuous pores.