Comparison on Dry Sliding Tribological Behavior of Ti-46Al-2Cr-2Nb and Ti6Al4V Alloys

The dry-sliding tribological behavior of a Ti-46Al-2Cr-2Nb intermetallic alloy was investigated. For comparative purposes, the tribological behavior of a common Ti-6Al-4V alloy was also examined under the same testing conditions. It was found that the wear resistance of the Ti-46Al-2Cr-2Nb alloy is superior to that of the commercial Ti-6Al-4V alloy. The friction coefficient of both the alloys is comparable. The wear rates of both the Ti-46Al-2Cr-2Nb and Ti-6Al-4V alloys increases with increasing applied load. The wear rate of the Ti-46Al-2Cr-2Nb alloy increases with increasing the sliding speed, but the opposite is true for Ti-6Al-4V alloy. The wear mechanism of the Ti-46Al-2Cr-2Nb alloy is fatigue wear, but that of Ti-6Al-4V alloy is dominated by plastic deformation, plowing and delamination.