Characterization of Al0.5FeCu0.7NiCoCr high-entropy alloy coating on aluminum alloy by laser cladding

Al0.5FeCu0.7NiCoCr high-entropy alloy (HEA) coatings were synthesized on aluminum by laser cladding, aiming at enhancing surface properties. Samples were characterized by using scanning electron microscopy with spectroscopy (SEM/EDS), X-ray diffraction, laser induced breakdown spectroscopy (LIBS), microhardness. The results showed that the HEA coatings exhibited good metallurgical bonding to the matrix by using optimized laser processing parameters. The HEA coatings were composed of fcc + bcc phases. All the composed elements can be noted in mapping through the calibration of the plasma, and the plasma of the collected Al confirmed that come from substrate dilution. The intensity change of Al-II reflected the depth variety of the cladding layer. The microstructure of clad layer was consisted of dendrite. The microhardness of HEA layer reached 750HV0.2 that was about 8 times larger than that of the substrate.