Tribological performance of NiAl alloy containing graphene nanoplatelets under different velocities

In this study, the friction and wear behavior of NiAl alloy containing graphene nanoplatelets (NG) under different sliding velocities were investigated. NG shows the better tribological performance, if compared to NiAl-based alloy without graphene nanoplatelets (NA). In the range of sliding velocities varying from 0.2 to 1.2m/s, the formation of glaze layer in NG could be easily distinguished. The beneficial effect of graphene nanoplatelets (GNPs) for the formation of glaze layer of NG is obvious, if compared to NA, resulting in the reduction of friction and improvement of wear resistance of NG. Moreover, a suitable higher sliding velocity will be better for the formation of glaze layer, but the wear rate will gradually increase with the increase of sliding velocity. It can be concluded that GNPs hold great application prospect as an effective solid lubricant to improve the tribological performance of NiAl alloys.