Abstract

This study presents the characteristics of hot deformation behavior of a Al_0.3CoCrFeNi high–entropy alloy in the temperature and strain rate ranges of 1023–1423 K and 10^–3–10 s^–1, respectively. The constitutive flow behavior was modeled based on the hyperbolic–sinusoidal Arrhenius–type equations and a mathematical relation was used to observe the influence of true strain on material constants. To define the hot workability of the alloy, a processing map was developed based on the principles of the dynamic materials model. Accordingly, a dynamic recrystallization (DRX) domain was identified as prudent for processing in the temperature and strain rate ranges of 1273–1423 K and 10^–2–2 × 10^–1 s^–1 respectively, with a peak efficiency of ~45% at 1423 K/6 × 10^–2 s^–1. At lower temperatures (1048–1148 K) and strain rates (10^–3–3 × 10^–3 s^–1), a dynamic recovery (DRV) domain was identified with a peak efficiency of 38% at 1123 K/10^–3 s^–1. A large instability regime occurred above 3 × 10^–1 s^–1 with an increased tendency of adiabatic shear bands. It extended to lower strain rates 10^–2–10^–1 s^–1 at temperatures < 1123 K, manifested by localized shear bands and grain boundary cracking. At low strain rates (5 × 10^–3–10^–3 s^–1) and temperatures (1148–1298 K), particle stimulated nucleation of new DRX grains occurred at B₂ precipitates, though the efficiency of power dissipation dropped sharply to ∼9%.