Effects of Rolling Deformation on Microstructure and Properties of Al_0.3CoCrFeNi High-Entropy Alloy

Al0.3CoCrFeNi high-entropy alloys (HEAs) were prepared by vacuum induction melting and then were rolled at different deformation degrees (30%, 60%, 90%). Microstructure, mechanical property and corrosion resistance property of these HEAs were investigated by OM, SEM, XRD, microhardness testing, tensile testing and electrochemical method. The results show that the grains in cast HEAs exhibited equiaxed, and were elongated along the rolling direction and finally formed fibrous microstructure during rolling. The hardness and strength of HEAs increased with the increase of the deformation degree, but the elongation decreased. In 3.5wt.% NaCl solution, HEAs had higher corrosion current density in rolled state than in cast state, showing lower corrosion resistance.