Significant transitions of microstructure and mechanical properties in additively manufactured Al–Co–Cr–Fe–Ni high-entropy alloy under heat treatment

The non-equimolar Al–Co–Cr–Fe–Ni high-entropy alloy was fabricated by combined cable wire arc additive manufacturing (CCW-AAM). Microstructure evolution and mechanical properties of this dual-phase (FCC + ordered BCC (B2)) alloy under 600 °C, 800 °C and 1000 °C heat treatment for 8 h were investigated. The as-deposited alloy was composed of FeCr-rich FCC phase and AlNi-rich B2 phase. Under heat treatment at 600 °C, a large number of Cr-rich σ...