Elevated-temperature wear behavior and wear resistance of TC11 alloy

Dry sliding wear tests were performed for TC11 alloy at 400~600℃ on a high-temperature wear tester. The wear behavior and wear resistance of TC11 alloy were studied. The phase, morphology and composition of worn surface and subsurface were examined by X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy dispersion spectrometer (EDS), respectively. The wear mechanism was also explored. At 400℃, the wear rate slightly increased with the increase of load, and then rapidly increased as the load surpassed 200 N. When the temperature was elevated to 500~600℃, the wear rate decreased to the lowest and almost did not vary as the load increased. The results showed that the worn surface presented plastic deformation and fracture as well as furrow along the sliding direction, simultaneously there were dense black smooth regions and delaminated regions at 400℃. Adhesive wear, abrasive wear and oxidative mild wear prevailed. Dense black smooth regions and delaminated regions mainly appeared on worn surface at 500~600℃, while the delaminated regions at 600℃ were less than those at 500℃. The predominated wear mechanism was oxidative mild wear. Tribo-oxide layers appeared on worn surface at various temperatures. The tribo-layer reached about 5~8 μm in thickness at 400℃, while it increased to 10~15 μm at 500~600℃. And the density of tribo-oxide layer increased with temperature increasing. The microhardness of tribo-layer reached above HV1000.With the temperature increasing, the microhardness significantly increased. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.