Abstract
In the present study, the concept of maraging characteristics has been manipulated using a multistep thermo-mechanical approach involving isothermal aging and reversion treatments. Accordingly, a novel metastable maraging Fe68Ni10Mn10Co10Ti1.5Si0.5 (at%) medium entropy alloy has been designed and microstructurally engineered to achieve a heterogeneous medium entropy alloy decorated by (NiMn)3−xTix and ƞ-Ni3Ti nano-precipitates. Remarkably, the alloy exhibited an ultra-high yield strength of ∼1.3 GPa with a total elongation of ∼25.3% in the partially reversed sample, attributed to several aspects of microstructural heterogeneities, including the dual-phase microstructure, compositional gradient heterogeneity, and nano-precipitates. We proposed a prospective direction for the development of high-performance materials for structural applications through the microstructural engineering of Fe-based medium entropy alloy.
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