Process Optimization and Performance Investigation of AlCoCrFeNi High-Entropy Alloy Coatings Fabricated by Laser Cladding
摘要
In this study, AlCoCrFeNi high-entropy alloy coatings were fabricated using laser cladding technology, and the effects of laser power and scanning speed on the microstructure and properties were systematically investigated. The results indicate that, with increasing laser power and decreasing scanning speed, the coating’s melt width, height, and depth significantly increase. Under the optimized parameters of 1200 W laser power and 6 mm/s scanning speed, the coating exhibited a dense microstructure, excellent interfacial bonding, and the highest average microhardness (387 HV), representing a substantial improvement over the substrate (221 HV). Furthermore, the coating under these conditions demonstrated the lowest friction coefficient (0.4708) and wear loss (39.8 mg), indicating superior wear resistance. Additionally, the corrosion resistance exhibited a nonlinear relationship with process parameters, achieving optimal values in corrosion potential (– 0.242 V) and corrosion current density (2.1 × 10−7 cm2) under the optimized conditions. Mechanical testing revealed that the coating reached peak tensile strength (1179 MPa) and elongation (11.4%), with fracture surfaces showing uniform dimple structures, confirming excellent plastic deformation capability. In conclusion, the optimized laser cladding parameters of 1200 W laser power and 6 mm/s scanning speed produced high-performance AlCoCrFeNi coatings with balanced mechanical properties, wear resistance, and corrosion resistance.