Microstructure and dry sliding wear resistance of CoTi intermetallic alloy

A wear resistant CoTi intermetallic alloy was fabricated by the laser melting deposition process. Microstructure of the alloy was characterized by OM, SEM, XRD and EDS and wear property was evaluated under room-temperature dry sliding wear test condition. Wear resistance of the CoTi intermetallic alloy under dry sliding wear test condition is up to 2 and 3.3 times higher than the hardened high-speed steel W18Cr4V and the bearing steel 1.0%C-1.5%Cr, respectively. The excellent wear resistance of the CoTi alloy is attributed to the inherent good toughness and strong yield-anomaly of the intermetallic CoTi as well as to the unique strong friction-induced hardening in the worn surface and subsurface of CoTi alloy under dry sliding wear process.