Microstructure and wear resistance of laser amorphousnanocrystals reinforced Ni-based coating on TA15 titanium alloy

Coaxial powder feeding laser cladding of the Ni60A-Ni coated WC-TiB₂-Y₂O₃ mixed powders on the aviation material TA15 titanium alloy substrate can form an amorphousnanocrystals reinforced composite coating. Such coating was researched by means of the microstructure observation, the microhardness test and the dry friction and wear test at room temperature. Investigation indicated that the such coating mainly consisted of γ-(Fe, Ni), WC, α-W₂C, M₁₂C, Ti-B compounds, Ti-Al intermetallics, amorphous phases and the Mo, Zr, V carbides.Amorphous, nanocrystalline and the other crystalline phases were existence in such coating. This coating also exhibited a better wear resistance than TA15 titanium alloy, and abrasive grain wear mechanism and the adhere wear mechanism did the process at the same time during the dry sliding wear process. The productions of the nanocrystals made the worn surface more smooth, favoring the decrease of the coefficient of friction and the wear volume losses.