Strain rate effects on the dynamic mechanical properties of the AlCrCuFeNi2 high-entropy alloy

The AlCrCuFeNi2 high-entropy alloy with a mixed face-centered cubic (FCC) plus body-centered cubic (BCC) structure is investigated. The as-cast sample shows a double-phase-eutectic microstructure. Quasi-static and dynamic compression tests with varying strain rates of 1×10−3–3×103 s−1 at ambient temperature are performed on the current system. The dynamic yielding strength approximately presents a linear relationship with the strain rate on the designated scale. The strain hardening rates upon dynamic loading are significantly enhanced specially at the initial plastic stage. The Johnson–Cook (J–C) plasticity model is employed to model the dynamic flow behavior, and the constitutive relationship is obtained as σ=(855+1436ε0.32)(1+0.004lnε̇*).