A comparative study on the dry sliding wear properties of TC4 and TC11 alloys at different sliding velocities

Wear properties of TC4 and TC11 alloys were comparatively investigated under various sliding velocities on an MPX-2000 type pin-on-disc wear tester. The wear rates, morphologies and compositions of worn surfaces, morphologies and properties of tribo-layers were studied and the wear mechanisms were also explored. TC4 and TC11 alloys shared almost the same wear regularity and characteristics. Both of the two titanium alloys had the optimal wear resistance at 4 m s(-1), the suboptimal at 0.75 m s(-1), and the worst at 2.68 m s(-1). The wear rate of TC4 alloy was always higher than that of TC11 alloy at different sliding velocities, especially at 4 m s(-1). With the rising of sliding velocity, titanium alloys underwent the transitions of wear mechanisms from the combination of abrasive wear and adhesive wear at 0.75 m s(-1) to delamination wear at 2.68 m s(-1), then to typical oxidative-mild wear at 4 m s(-1).