Abstract
This paper aims to investigate the effect of graphene nanoplatelets on tribological properties of Titanium alloy (Ti-3Al-5Mo-4.5V-2Cr-1Nb-1B) (TC16) at different sliding velocities. TC16 alloy containing 1.5 wt% graphene nanoplatelets (GNPs) (TAG) had been fabricated using spark plasma sintering (SPS) technique, and the tribological tests were conducted using a ball-on-disc high-temperature tribometer. The morphologies and compositions of worn surfaces of TAG were observed at various sliding velocities using electron probe microanalysis (EPMA). Moreover, subsurface morphologies were observed using field emission electron microscope (FESEM). At a lower sliding velocity, the material transfer from the counterpart ball to the specimen was found, and tearing behavior of graphene film also occurred which lead to the severe wear and higher friction coefficient. The friction coefficient and wear rate were recorded the minimum values at higher sliding speed due to the formation of continuous graphene film, and plastic deformation was also least. Moreover, the optimum sliding speed could promote the formation of graphene lubricating film to achieve good lubricating effect. With the increase of sliding speed, the enhancement of tribological properties of graphene nanoparticles can open the door for titanium alloys to be used as cutting tools and other high speed friction applications.
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