|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||Improved Properties of Non-Equiatomic MnFeCoNiCu HEA Compared to its Equiatomic Counterpart
||Tibra Das Gupta, Artashes Ter-Isahakyan, Thomas John Balk
|On-Site Speaker (Planned)
||Tibra Das Gupta
In this study, we argue that within a high entropy alloy (HEA) system the most stable composition is not always equiatomic. Other favorable compositions may exist that will exhibit superior phase stability and improved mechanical properties. We demonstrate this by cooling an equiatomic CrMnFeCoNiCu from the melt over a period of three days. This results in large Cr-rich precipitates and a nearly Cr-free matrix with compositions within the MnFeCoNiCu system. Leveraging this result, we argue that the most stable composition lies in the MnFeCoNiCu system rather than the CrMnFeCoNi system. Taking MnFeCoNiCu as a basis for new alloys, we compared the mechanical properties between the equiatomic and non-equiatomic counterparts, using nano-indentation and a custom-built micro-specimen test system. These approaches yielded bulk alloys that exhibited improved mechanical properties in comparison to their equiatomic counterparts.