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Aluminum alloys are preferred engineering material for automobile, aerospace and mineral processing industries for various high performing components that are being used for varieties of applications owing to their lower weight, excellent thermal conductivity properties. Aluminum alloy7075 possesses very high strength, higher toughness and are preferred in aerospace and automobile sector [1][2][3]. The composites formed out of aluminum alloys are of wide interest owing to their high strength, fracture toughness, wear resistance and stiffness.The purpose of the present work is to produce the carbon multiwall carbon nanotubes (MWCNs) reinforced MMCs by mechanical milling (MM), examine the mechanical behavior after the incorporation of MWCNs in 7075 aluminum alloy in function of nanotubes percentage of concentration, distribution and size on the microstructure and identify strengthening mechanism presents.Raw materials were 7075 aluminum alloy as the metal matrix and MWCNTs with a mean diameter of 100 nm as reinforcement agent. Initial aluminum alloy burrs were produced by machining of commercial solid bar. These coarse powders were mixed with MWCNTs at different concentrations; chemical composition of Al7075 is shown in Table 1. The mechanical milling of powder mixture was performed in a high-energy SPEX 8000 mill, under an inert atmosphere of pure argon gas. The milling container was made of stainless steel and milling media was made of hardened chrome steel, 5 drops of methanol was used as a process control agent (PCA) to avoid excessive cold-welding of the powder particles. The Al7075-MWCNT composite powders used to prepare compression samples were ball milled for 2 hours. A blank (Al 7075) sample without any reinforcement addition was produced under the same conditions for comparison purposes. The milling ball-to-powder weight ratio was set at 5:1.

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