Dry sliding wear behavior of XD^TMZl201/TiB₂ in-situ composite

Microstructure and dry sliding wear behavior of XD^TMZl201/TiB₂ in-situ composite were studied by SEM, TEM, XRD and pin-on-ring friction and wear test. ZL201/TiB₂ in-situ composite aged at 175°C consists of dispersive sub-micrometer TiB₂ particle, fine θ″, θ′ precipitates and α-Al solid solution. Contrasted to the unreinforced ZL201 alloy, ZL201/TiB₂ in-situ composite possesses a higher microhardness and wear-resistance. The predominant wear mechanism of ZL201/TiB₂ composite is adhesive wear and melting wear under these conditions used in this study. A transition of wear mechanism for ZL201/TiB₂ composite occurs from adhesive wear to melting wear with the increase of sliding distance. At the later stages, localized melting of worn surface and following delamination from seizure or the large plastic deformation of matrix are dominant factors for the removal of composite.