Research on friction and wear behavior of a bulk metallic glass under different sliding velocity

摘要

Linear reciprocating sliding friction and wear behavior in a Zr55Cu30Ni5Al10 bulk metallic glass (BMG) at different sliding velocities was investigated. The friction and wear tests nearly have not changed the amorphous structure and thermal stability of the BMG. The sliding velocity significantly affects the friction and wear behavior of the BMG. During the frictional and wear tests, the average frictional coefficient locates between 0.244 and 0.302 and increases gradually with increasing sliding velocity. The grinding trace width locates between 36 mu m and 227 mu m and descends gradually with increasing sliding velocity. The grinding traces exhibit smooth linear furrows, on both sides of which some heaping alloy scraps can be observed, while at the ends of which these accumulation extent of surface alloy scraps becomes more serious. The smaller the sliding velocity is, the more serious the wear extent is. At smaller sliding velocities, the wear mechanism inclines to the combined effects of continuous wear, occlusion or bite welding, adhesive wear and abrasive wear. With the increase of sliding velocity, the wear mechanism changes gradually to a combined result of slight bite or bite welding and continuous wear. (C) 2015 Elsevier B.V. All rights reserved.