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— In the current study, Friction stir processing (FSP) was used to stir and mix Cu and graphite particles (Gr) into the surface of a pure aluminum plate to form a composite layer up to 3 mm thick. Wear test and friction coefficient of hybrid composite layer are investigated experimentally using a pin-on-disc apparatus at different normal load conditions 5, 10, 15, 20 and 25 N with different sliding speeds 0.5, 1, 1.5, 2 and 2.5 m/s. Also, tensile and micro-hardness properties were evaluated in detail. Microstructure of the surface hybrid composite revealed that Cu and Gr are uniformly dispersed in the stir zone (SZ). The results showed the Gr particles were refined and uniformly distributed in the matrices as a result of stir processing. This significantly improves mechanical properties. The results revealed that the friction coefficient increases when sliding velocity is increased.

Influence of (Gr+ Cu) Particles on Wear and Mechanical Properties of Aluminum Based Surface Hybrid Composites Fabricated Via Friction Stir Processing