Metallographic Study and Sliding Wear Optimization of Nano Si3N4 Reinforced High-Strength Al Metal Matrix Composites

The strongest among the all-aluminum alloy series is 7xxx due to its unique composition of alloying elements, making it perfect for automotive and aerospace applications. present research included manufacturing Si3N4 reinforced aluminum (AA) 7068 nanocomposites via stir casting combined with ultrasonication, followed by a bottom pouring technique. reinforcement has been conducted in different fractions (0.5, 1, 1.5, 2%) weight. microstructure characterization prepared composites was using FESEM, EDS, elemental mapping. AA7068 matrix significantly refined after incorporating nanoparticles. hardness increased addition maximized at 1.5 wt.% effect hard Si3N4, difference thermal co-efficient, Hall-Petch, Orowan strengthening mechanism. wear resistance (Si3N4)np load-bearing capacity nanocomposites. mainly adhesion, two-body, three-body abrasion Optimization parameters completed Taguchi approach. L-25 orthogonal array selected perform test, and, later, ANOVA tool used understand percentage contribution each factor. load maximum 65.67%, sliding distance. Minimum loss noticed when test on optimum (1.5 reinforcement, 10 N load, 400 m distance). Hardness behavior were oppositely influenced clustering particles found 2