Synergic Combination of Strength and Ductility through Both Grain Refinement and Precipitation in Al0.3CoCrNi Medium-Entropy Alloy

To improve the tensile properties of Al0.3CoCrNi (at%), herein, medium-entropy alloys at room temperature, high-pressure torsion (HPT), and appropriate annealing are presented. Severe deformation due to HPT causes fine grains and evenly distributed B2 and sigma precipitates with a nanometer scale through an annealing procedure. A synergic combination of yield strength over 1.0 GPa and uniform elongation over 25% is obtained due to the simultaneous utilization of both grain refinement and precipitation strengthening.

Automated summary

To enhance the tensile properties of Al0.3CoCrNi (at%) medium-entropy alloys at room temperature, high-pressure torsion (HPT) and appropriate annealing are employed. Severe deformation induced by HPT leads to the formation of fine-grained structure and nanometer-scale B2 and sigma precipitates, which result in a synergistic combination of high yield strength (>1.0 GPa) and large uniform elongation (>25%) by utilizing grain refinement and precipitation strengthening simultaneously.