A novel strategy for enhancing mechanical performance of Al _0.5 CoCrFeNi high-entropy alloy via high magnetic field

We report a novel strategy that can enhance the mechanical performance of Al _0.5 CoCrFeNi high-entropy alloy (HEA) with high pulse magnetic field (PMF) using 10 T field intensity versus different pulse times at room temperature. Results show that the yield strength (σ _0.2 ) and ultimate tensile strength (σ _b ) of Al _0.5 CoCrFeNi are typically improved with the increasing of pulse times, which respectively increase by 22% and 20% after 20 times of pulse field treatment. Microstructure characterization shows no substantial changes in the micro-scale. However, high density dislocations are found in the FCC-phase dendrites after PMF treatment, which is the main reason for the enhancement of the mechanical properties. Our results show that the PMF treatment can efficiently tune the mechanical properties of HEA at room temperature without any thermal-mechanical treatment.