Abstract
The present work is focused on the evaluation of mechanical and tribological properties of ceramic particle reinforced aluminum matrix composites (AMCs) fabricated by stir casting process. Aluminum alloy Al6061 has been used as base matrix with silicon carbide (SiC) and aluminum oxide (Al2O3) particles used as reinforcements at varying weight fractions of 5%, 10% and 15%. The main objective is to determine the effect of reinforcement ratio on hardness, tensile strength, wear resistance and microstructure. Stir casting was selected due to its suitability for low cost production applications besides achieving uniform particle distribution when appropriately optimized for process parameters. The developed samples were tested for tensile strength, hardness values besides conducting dry sliding wear test using pin-on-disc apparatus to study their tribological behavior. Scanning electron microscopy (SEM) analysis has been carried out for studying microstructural distribution as well interface bonding between matrix & reinforcing particles. Hardness and wear resistance had shown an increasing trend with the percentage of reinforcement, while tensile strength increased up to 10% reinforcement and slightly decreased at 15% because of particle agglomeration and porosity. Microstructural analysis revealed ceramic particles well dispersed uniformly at lower contents but clusters formed at higher contents. A comparative analysis found mechanical properties and tribological behavior optimum in a composite reinforced with 10 wt.% hence highlighted between particle strengthening interaction and structural integrity.
Keywords
Aluminum matrix composites (AMCs)Stir castingSilicon carbide (SiC)Aluminum oxide (Al₂O₃)Mechanical and tribological propertiesReferences
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