Dry Sliding Wear Behavior of TiC-AA7075 Metal Matrix Composites

The AA7075 matrix reinforced with 2 to 10 weight % of TiC particles were made by stir casting. Effects of load on the wear and friction of the worn surfaces of matrix and composite pins sliding against a rotating disc have been investigated under dry condition. The wear tests were carried out using a pin-on-disc type apparatus at three different loads (10, 20 and 30N) under a constant velocity of 2m/s for a sliding distance of 2Km. The coefficient of friction was recorded and wear rate of the Aluminum metal matrix composite (AMMC) pins calculated from mass loss measurement. Scanning electron microscope (SEM) equipped with energy dispersive X-ray spectroscopy (EDX) was used to investigated the worn surface. It is observed that higher load leads to higher wear rate and lower coefficient of friction for matrix as well as composites. The hardness was found to increase with the increase in wt. % of the reinforcement.