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Aluminum-based metal matrix nanocomposites (MMNCs) are gaining popularity in automotive, aerospace, and marine industries due to their lightweight, high strength, and excellent wear resistance. In this study, AA 7075 alloy was used as the base material and reinforced with nano-sized aluminum oxide (Al2O ), silicon carbide (SiC), and a fixed amount of magnesium (1 wt.%) to improve wettability. These reinforcements were added in varying weight percentages (1%-4%) using the stir casting method, which ensures uniform particle distribution and reduces porosity. Microstructural analysis confirmed a mostly uniform dispersion of particles, while mechanical tests showed that the addition of reinforcements significantly improved hardness, tensile strength, and wear resistance, although ductility slightly decreased. Hybrid composites (Al2O + SiC) performed better than those with single reinforcements. Overall, the study demonstrates that stir-cast AA 7075 nanocomposites offer enhanced properties and are well-suited for high-performance engineering applications.