Fabrication and characterization of aluminum-silicon carbide metal matrix composites

Different combinations of materials have been recognized for specific applications in various sectors like aerospace, transport, and marines. The aluminum metal matrix composite is one of the attractive combinations where aluminum as a base material is reinforced with ceramic particulates for a high strength-to-weight ratio, low density, high wear resistance, and many other improved mechanical properties. In our study, silicon carbide (SiC) ceramic as a reinforcement is added to the aluminum matrix. A liquid stir casting route is employed for fabricating three composite specimens in which 0%, 2.5%, and 5% SiC particulates were dispersed in the base aluminum matrix. It becomes imperative to study the physical and mechanical properties for which specimens were carefully machined as per the requirement of different tests. Density, hardness, and tribological tests were carried out as well as a microstructural study using optical microscopy was performed. Wear test results depict a decrease in wear rate with increasing percent of SiC in the specimens. The liquid stir casting methodology adopted for fabricating composites is well suited as disclosed in the microstructural study.