Effect of Graphite on Mechanical and Tribological Properties of Al6061/SiC Hybrid Composites

This study investigates the effects of incorporating graphite into a Al6061/SiC hybrid metal matrix composite on its mechanical and wear properties. The composites are fabricated using a stir casting technique, with SiC and Graphite particles added in different weight percentages ranging from 2-8%. Mechanical properties such as hardness, tensile strength, flexural strength, and compressive strength are evaluated. Results show that the composite with 6 wt.% of hybrid reinforcement exhibits significant improvement in hardness (30%), tensile strength (10.82%), compressive strength (68.14%), and flexural strength (85%) compared to pure Al6061 alloy. Furthermore, a wear test is performed using a pin-on-disc machine under dry conditions to assess the influence of parameters on the wear rate and coefficient of friction (COF). Tests are conducted at various loads (1-3 kgf), sliding speeds (150-450 rpm), and sliding distances (1000-2000 m). Among all reinforcements, the composite with 6% hybrid reinforcement exhibits the lowest wear rate and COF. Overall, this study provides valuable insights into the mechanical and wear properties of Al6061/SiC/graphite hybrid composites and highlights their potential for various industrial applications. These findings may pave the way for further research in the field of metal matrix composites and their applications.