Wear mechanism of XDTM ZL201-TiB2 in situ composite

摘要: The microstructure and dry sliding wear behaviour of XDTM ZL201–TiB2 in situ composite were studied by scanning electron microscopy, transmission X-ray diffraction, pin-on-ring friction testing. microstructural constituents the aged at 175°C for various ageing times found to be dispersive submicrometre TiB2 particles, fine θ″, θ′-precipitates α-Al solid solutions. As contrasted unreinforced ZL201 alloy, possessed a higher microhardness wear-resistance as well shorter time peak hardness. With increase distance, transition dominant mechanism occurred from adhesive fatigue contacts. At earlier stages wear, characteristics featured mild scratchings plastic smearing observed on worn surface platelet-type debris; but later stages, contact failure relatively thick layer relative motion, which revealed build-up layer-like structure presence spherical particles debris, became factor removal composites. © 1998 Chapman & Hall