The dry sliding wear characteristics of metal matrix composites made of LM24 aluminium alloy reinforced with nano alumina (Al₂O₃) and graphite (Gr) are carried out. The aluminium alloy hybrid composites were prepared by the stir casting technique. In the present study, the wear behaviour of LM24-Al₂O₃-Gr hybrid composites with various weight percentages of Al₂O₃ (1, 3 and 5%) with a constant weight of 1% Gr reinforcement are studied. The parameters taken into account of wear bear behaviour of hybrid composites are applied load (10, 20 and 30 N), sliding distance (500, 1000 and 1500 m), sliding speed (200, 300 and 400 rpm) and Al₂O₃ (1, 3 and 5%) reinforcement. Wear tests are performed using the design of experiments, L27 orthogonal array on pin-on-disc equipment and identified optimising wear parameters in order to minimize the wear rate of LM24-Al₂O₃-Gr hybrid composites. The uniform distribution of reinforcement particles (Al₂O₃ & Gr) in the LM24 matrix is ensured by FEMSEM microscopy. The second-order polynomial regression models and the 3D surface plots are generated based on the wear parameters using response surface methodology. A minimum wear rate of 0.0021 mm³/m and a minimum coefficient of friction of 0.141 are observed experimentally

Keywords: LM24 aluminium alloy, Nano alumina, Graphite, Pin-on-disc, FESEM.