Hot deformation behavior of an Al₁₃Cr₁₀Fe₄₀Ni₃₆Mo₁ hypoeutectic high entropy alloy

Eutectic high entropy alloys (EHEAs), combining excellent comprehensive properties with good castability, are promising materials. Hot working plays a pivotal role in refining the microstructure and enhancing the properties of EHEAs. This study investigated the hot deformation behavior of an Al₁₃Cr₁₀Fe₄₀Ni₃₆Mo₁ hypoeutectic HEA via uniaxial compression tests at 1173-1453 K and strain rates of 0.05-5 s⁻¹. The constitutive model was developed to describe the flow behavior, and the hot processing map was established via the Dynamic Material Model (DMM). Dynamic recrystallization (DRX) occurred in two domains 1423-1453 K at 0.5-5 s⁻¹ and 1423-1453 K with 0.05 s⁻¹. The FCC matrix underwent softening primarily through discontinuous dynamic recrystallization (DDRX), and the B2 matrix was softened mainly through continuous dynamic recrystallization (CDRX). At 1453 K, elevated strain rates facilitated the formation of Σ3 TBs, which promoted DRX in the FCC matrix. By correlating the processing map with the corresponding microstructures, the optimal hot working window was identified as 1423-1453 K and 0.5-5 s⁻¹. This study contributes to advancing the industrial application and development of hypoeutectic HEAs.