Dual-Intermetallic FeCoNiSi High-Entropy Alloy Fabricated by Arc Melting: Insights into Deformation Behavior and Corrosion Resistance

This study investigates a FeCoNiSi high-entropy alloy (HEA) produced via vacuum arc melting. The alloy exhibits a distinct dual-intermetallic microstructure, comprising orthorhombic Ni₂Si-type and cubic Fe₄Si₄-type phases, unlike the predominantly single-phase solid-solution structures reported for similar FeCoNi-based systems. Hot compression tests performed from ۵۰۰–۸۰۰ °C revealed a transition from brittle to ductile deformation, with dynamic recrystallization (DRX) occurring at higher temperatures. Avrami analysis yielded exponents of n = ۱.۷۴ (at ۷۰۰ °C) and n = ۳.۴۱ (at ۸۰۰ °C), indicating that the DRX mechanism depends on temperature. Electrochemical tests in ۳.۵ wt.% NaCl confirmed excellent corrosion resistance, evidenced by a low corrosion current density and spontaneous passivation. These results demonstrate the potential of FeCoNiSi HEAs for applications in high-temperature and corrosive environments.

کلیدواژه ها:

FeCoNiSi high-entropy alloy ، Arc melting ، Dynamic recrystallization ، Intermetallic phases ، corrosion resistance