Hot deformation behavior of as-cast and homogenized Al_0.5CoCrFeNi high entropy alloys

The hot deformation behavior of as-cast and homogenized Al_0.5CoCrFeNi high entropy alloys (HEAs) during isothermal compression was investigated as a function of temperature and strain rate. Results indicated that flow stress in a homogenized state was always higher than that in an as-cast state under the same deformation conditions. Moreover, the optimum thermo-mechanical processing (TMP) conditions for the hot working of the homogenized state were identified as 945-965 °C and 10^-1.7-10^-1.1 s^-1 and were easier to determine in practice. Constitutive equations, for both states, correlating the flow stress of Al_0.5CoCrFeNi with strain rate and deformation temperature were also determined.