Hot deformation behaviors and their constitutive modeling of dual-phase Al0.6CrMnFeCoNi high-entropy alloy

In this paper, a dual-phase Al0.6CrMnFeCoNi high-entropy alloy (HEA) was subjected to hot deformation at various deformation temperatures from 1073 K to 1373 K and different strain rates from 10−3 to 1 s−1. A detailed analysis of the flow curves and microstructural evolution of this HEA was conducted under different hot deformation conditions, and the constitutive equation was established. The power dissipation map and the instability map were plotted together to obtain the processing map. The processing map reveals the optimum hot working region is located at the conditions of 10−2.5∼ 10−3 s−1 and 1323∼ 1373 K. This processing map guides hot deformation behaviors of Al0.6CrMnFeCoNi HEA. Microstructure analysis revealed dynamic softening behavior during hot deformation in the FCC+BCC dual-phase; however, the dynamic recrystallization (DRX) mechanisms of the HEA phases differed significantly. Specifically, the FCC phase exhibited a hybrid mechanism combining continuous and discontinuous DRX, whereas the BCC phase demonstrated exclusively continuous DRX.