| Summary: | Aluminum-based AlCoCrFeNi high-entropy alloy (HEA) composite was fabricated by rapid cooling under water after applying friction stir processing to modify the surface properties of aluminum. The microstructure was characterized by using SEM and EBSD. The microhardness and tribological properties of composite were analyzed on microhardness tester and friction and wear equipment, and wear mechanism was discussed. The results show that the HEA particles are uniformly distributed in the Al matrix with refined grains, the particle-matrix interface is clean with no obvious interface reaction layer. The microhardness and wear resistance of Al surface composite are significantly improved with the increase of HEA particulate contents. When the volume fraction of HEA particles is 15%, the microhardness and wear rate of composite is 147 HV0.2 and 85×10-5 mm3/m, which are 69% higher and 43% lower than those of the base material, respectively. The worn surface analysis reveals that the wear mechanism is transformed from adhesive wear to abrasive wear in the composite with the increase of HEA particulate contents.
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