The functionally graded materials are innovative materials that possess good properties than traditional composite materials. However, this material yields at lower stress and undergoes slightly higher wear than traditional materials. Hence, the primary goal of this work is to enhance the mechanical and tribological properties of functionally graded aluminium metal matrix composites (FGAMMC) by silicon nitride and titanium dioxide nano particle reinforcement. A hollow cylindrical specimen with dimensions of 150 150 20 mm with three combinations Al 7075+Si₃N₄, Al 7075+TiO₂ and Al 7075+Si₃N₄+TiO₂ was fabricated via liquid metallurgy followed by centrifugal casting. The fabricated novel FGAMMC materials are investigated based on their mechanical and tribological properties and compared with base material Al 7075. The investigation result reveals that, the concentration of Si₃N₄ and TiO₂ is higher in the outer surface than in the inner surface, ensuring a graded distribution. The hardness of Al 7075+Si₃N₄+TiO₂ is increased by 36.94% in the outer surface and 21.86% in the middle surface compared with Al 7075. The ultimate tensile strength of Al 7075+Si₃N₄+TiO₂ is recorded as 42.23% higher than the Al 7075. The Al 7075+Si₃N₄ specimen produced less wear rate compared with the Al 7075, Al 7075+TiO₂ and Al 7075+Si₃N₄+TiO₂ specimens.

Keywords: Functionally graded aluminium metal matrix composites, Hardness, Tensile strength, Wear.