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In the present study, the aluminium hybrid composites (AHCs) are developed by the powder metallurgy method. Pure aluminium is reinforced with varying weight percentages of ceramic reinforcements (Si 3 N 4  and ZrO 2 ). Pure aluminium powder is mixed with 3 wt% Si 3 N 4  and (0, 1.5, 3 and 4.5 wt%) ZrO 2  powder in a centrifugal ball mill at a high speed of 600 rpm for 2.5 hours. The XRD results of the AHC powders shows that no interfacial reaction takes place during the ball milling process. The powder composites are then compacted at three different compaction pressure (340,420 and 500MPa) and sintered in a tube furnace at 500 °C for 30 minutes under an Argon environment. The SEM results of different composites show that the reinforcement and matrix particles are distributed uniformly with the accumulation of nano-size ZrO 2  particles. The density and micro-hardness improve with high compaction pressure and weight percentages of the reinforcements but the porosity decreases. The maximum hardness value is found as 72 VHN for sample E (Al+3 wt% Si 3 N 4  + 4.5 wt% ZrO 2 ) at 500 MPa.

Influence of compaction pressure and Si 3 N 4 /ZrO 2 reinforcement on the properties of aluminium hybrid composites