Abstract
FeNiCoCrTi0.5Nbx (x = 0.25, 0.50, 0.75, 1.00) high-entropy alloy coatings are prepared by laser cladding. The phase, microstructure, hardness and wear resistance of each coating are analyzed. The results show that each coating has BCC, FCC and Laves phase and the content of Laves phase increases with the increase of Nb content. The microstructure of those coatings are obviously different with the change of Nb content. The top and bottom of each coating are composed of equiaxed crystals and columnar crystals with preferential orientation, respectively. While the middle part of coatings shows different forms of dendrites, equiaxed cellular dendrites and short strips structure. The hardness of each FeNiCoCrTi0.5Nbx coating is much higher than that of the substrate. FeNiCoCrTi0.5Nb0.5 coating has the highest average hardness of 766.62 HV. Furthermore, the highest hardness measured of FeNiCoCrTi0.5Nb0.5 coating reaches up to 852.5 HV, which is about 2.9 times the hardness of the matrix. Each FeNiCoCrTi0.5Nbx coating produces abrasive wear. The worn surface of FeNiCoCrTi0.5Nb0.5 coating is smoother, the degree of wear is lower and the corresponding wear rate is the lowest. The FeNiCoCrTi0.5Nb0.5 coating has the highest hardness and the best wear resistance.
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