Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 968, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2023.171870
Keywords
Medium entropy alloys; Heterogeneity; Multiphase; Nano-precipitates
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In this study, the concept of maraging characteristics was manipulated by a multistep thermomechanical approach. A novel metastable maraging Fe68Ni10Mn10Co10Ti1.5Si0.5 (at%) medium entropy alloy was designed and microstructurally engineered with heterogeneities to achieve ultra-high yield strength and total elongation. This provides a prospective direction for the development of high-performance materials for structural applications.
In the present study, the concept of maraging characteristics has been manipulated using a multistep thermomechanical 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 n-Ni3Ti nanoprecipitates. 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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