Abstract: CoCrFeNiSi-xTiB2(x=2.5%, 5.0%, 7.5%, 10.0%, in weight percentage) high-entropy alloy (HEA) composite coatings were laser clad on 40Cr surface. The phase, microstructure, hardness, friction wear, and electrochemical corrosion properties of the coatings were analyzed, and the influence of nano-TIB2 ceramic particles on the HEA coating was discussed. The results showed that when x=2.5%, 5.0%, 7.5%, the coating phases were composed of biphase FCC and BCC, and when x=10.0%, boride CrB was formed on the basis of the two phases, and the microstructure changed from equiaxial crystals to typical columnar dendrites. The microhardness of the coating increased with the increase of nano-TiB2 particles. When x=10.0%, the average hardness of the coating reached its maximum value of HV547.11, about 2.72 times higher than that of the substrate. The hardness increase could be ascribed mainly to solid solution strengthening and dispersion strengthening. With the increase of TiB2 content, the wear loss of the composite coating decreased significantly, and the wear loss was only 0.13 mg by adopting an x value of 10.0%. In general, the increasing addition of TiB2 results in the conversion of main wear mechanism of the composite coating from severe abrasive wear and oxidation wear into slight abrasive wear and oxidation wear, and an obviously improved wear resistance. In 3.5%NaCl solution, the composite coating with x=7.5% achieved the best wear resistance.
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