Abstract
Aluminum (Al)-based aluminum oxide (Al2O3) and silicon carbide (SiC) particles hybrid metal matrix composites were processed by powder metallurgy technique, followed by sintering at 500 °C and then hot extrusion. The tribological properties of these composites with different weight fractions of Al2O3 and SiC were investigated; extrusion process significantly reduces the extent of porosity after cold compaction and sintering processes. Hybridization of the two reinforcements improved hardness and wear resistance of the composites. With an increase in SiC content, hardness was increased and consequently the wear resistance was enhanced also. Scanning electron microscopy observations show a better interfacial bond between matrix and reinforcements and a better distribution of the reinforcements.
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