Effect of rotational sliding velocity on surface friction and wear behavior in Zr-based bulk metallic glass

A Zr55Cu30Ni5Al10 bulk metallic glass (BMG) with a dimension of 1 mm × 10 mm × 70 mm was prepared by using copper-mold suction casting and the effect of rotational sliding velocity (RSV) on the surface dry friction and wear behavior was studied at room temperature. The results showed that the grinding traces of the BMG specimens remain an amorphous structure after friction and wear behavior tests under a load of 5 N with a rotational velocity range of 200-1400 r/min through 8 min. The friction coefficients mainly locate between 0.15 and 0.35. With increasing RSVs, both average friction coefficient and wear weight loss present an upward trend. Obvious molten characteristics can be observed in all grinding traces. At lower RSVs, the wear mechanism tends to a combined action of continuous wear and surface flow, while at higher RSVs, the wear inclines to surface flow. In addition, slight oxidation and adhesion wear accompany during all friction and wear behavior tests.