Synergistic effects of Mo and in-situ TiC on the microstructure and wear resistance of AlCoCrFeNi high entropy alloy fabricated by laser cladding

Abstract

The AlCoCrFeNi high entropy alloy coatings reinforced by the high melting point element Mo and in-situ TiC were fabricated by using laser cladding. The BCC phase existed in all the coatings. When Mo and in-situ TiC were doped individually, the existence of the σ phase and dendritic TiC particles were detected, respectively. However, on simultaneous doping of Mo and in-situ TiC, no σ phase was observed, and flower-like TiC particles were detected. In addition, the simultaneous doping of Mo and in-situ TiC resulted in a wear resistance of 3.14 and 2.6 times greater than that in case of individual doping of Mo and in-situ TiC, respectively, indicating the manifestation of a synergistic effect in improving wear resistance.