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Abstract
Equi-atomic CuNiCrFeAl high-entropy alloy powders were produced by vacuum induction melting and an inert gas atomization route in bulk quantities. Laser cladding of high-entropy alloy powders was carried out on a nickel aluminum bronze alloy substrate to increase its corrosion resistance in marine environment. The laser cladding process parameters were optimized to achieve a defect-free clad surface on the NAB substrate. The coated surface was further characterized for microstructure, phases, hardness, and corrosion resistance. The coating consists of a fine-grained multiphase (FCC+BCC+B2) microstructure. Compared with the NAB alloy substrate, the coating has a hardness of 522 ± 21 VHN which is four times harder than NAB substrate having 180 ± 6 VHN. Also, the I corr of the HEA coating is 8.14 × 10−7 A/cm2 which is approximately two orders of magnitude less than that of the NAB alloy (1.02 × 10−5 A/cm2) which implies better corrosion resistance.
Published Version
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