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Metal matrix composites are found to have many applications in the materials and structural engineering field. In this work, an investigation is carried out to find the influence of process parameters such as pulse current (I), pulse on time (T on ), pulse duty factor (s), and voltage (V) on the machining of Al(6351)-5 wt% silicon carbide (SiC)-5 wt% boron carbide (B 4 C) hybrid composite through electrical discharge machining. The individual parameters were analyzed with an objective to minimize electrode wear ratio (EWR), surface roughness (SR), and power consumption (PC). The experimental result shows that the output responses were greatly influenced by pulse current, with a contribution of 33.08% to EWR, 76.65% to SR, and 48.08% to PC. The surface characteristics were also examined through scanning electron microscope and the presence of craters and recast layers was observed.

Fly ash particles are potentially used in metal matrix composites due to their low cost, low density, and availability in large quantities as waste by-products in thermal power plants. This study describes multifactor-based experiments that were applied to research and investigation on dry sliding wear system of stir-cast aluminum alloy 6351 with 5, 10, and 15 wt.% fly ash reinforced metal matrix composites (MMCs). The effects of parameters such as load, sliding speed, and percentage of fly ash on the sliding wear, specific wear rate, and friction coefficient were analyzed using Grey relational analysis on a pin-on-disc machine. Analysis of variance (ANOVA) was also employed to investigate which design parameters significantly affect the wear behavior of the composite. The results showed that the applied load exerted the greatest effect on the dry sliding wear followed by the sliding velocity.

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