Laser assisted synthesis of Al0.1CoCrFeNi High Entropy Alloy Coating: Microstructures and Properties

In this work, Al0.1CoCrFeNi high-entropy alloy coatings were prepared by laser cladding on the surface of H13 steel, respectively by preset method and synchronous powder feeding method. Both the preset coating and synchronous coating show simple structure of FCC (Face-Centered Cubic) solid solution. Also, similar microstructures are obtained, which are typically fine equiaxed crystals at upper layer and columnar crystals with obvious growth trends near the metallurgical bonding interface of coating and matrix. Obvious passivation phenomenon can be observed in the potentiodynamic polarization curves. The coatings show larger corrosion potentials and lower corrosion current density that H13 steel, indicating that the coatings exhibit better corrosion performance than H13 steel. Furthermore, with the various loads, the coatings always show smaller the friction and wear coefficient and the volume wear rate than H13 steel. It indicates that H13 steel can be optimized by laser cladding Al0.1CoCrFeNi high-entropy alloy coatings.