Microstructure and wear resistance property of AlFeCrNiMox coatings by plasma cladding

Abstract

AlFeCrNiMox (x values in molar ratio, x = 0.5; 0.8; 1.0) high-entropy alloys coatings were prepared by plasma cladding technology. The phase structure, microstructure, microhardness and wear resistance were researched based on x-ray diffraction, scanning electron microscope (SEM), microhardness tester and wear testing machine, respectively. When x = 0.5, the plasma cladding coating shows coarse grains. When the Mo content reaches to 0.8, fine needle-like microstructure occurs near the grain boundary while the whole grain will consist of needle-like phases with the Mo content increases to 1.0. The hardness of the AlFeCrNiMox high-entropy alloys increases and the Mo1.0 alloy shows the highest hardness of 747.64HV0.2. The high Mo content contributes a great improvement in wear resistance. This improvement is attributed to the higher hardness, which is the transformation from the simple AlNi-base BBC phase to the needle-like fine microstructure.