Characterization of mechanical and tribological properties of graphite and alumina reinforced zinc alloy (ZA-27) hybrid metal matrix composites

Abstract

The aim of present study is to investigate the microstructural, mechanical and tribological behavior of Zinc Alloy (ZA-27) hybrid metal matrix composites reinforced with graphite (Gr) and alumina (Al2O3). In the present study graphite and Al2O3 content is varied with composition (0, 3.5, 7 and 10.5 wt. %) prepared with liquid state stir casting process. Microstructure, density, hardness, compressive strength, impact strength and wear rate of composites have been investigated. SEM micrograph shows the uniform distribution of reinforcement particles in ZA-27 matrix. It is found that mechanical properties of composites depend on the reinforcements content. Hardness, compressive strength and impact strength of composites increases with an increase in reinforcements content up to 7 wt. %. It is observed that reinforced composites show good tribological properties. Wear resistance of composites is increased with an increase in hybrid reinforcement content. Maximum wear resistance is found at 10.5 wt.% reinforcements content. Further, TOPSIS methodology is adopted for the optimization of reinforcements content which shows that 7 wt.% of reinforcements provide better mechanical properties among all the compositions. It is expected that this composite will be beneficial in automobile industries.