Optimization of wear properties on LM24 aluminium alloy reinforced with nano alumina and graphite using response surface methodology
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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 bearbehaviour 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, L27orthogonal array on pin-on-disc equipment and identified optimising wear parameters in order to minimize the wear rate ofLM24-Al2O3-Gr hybrid composites. The uniform distribution of reinforcement particles (Al2O3 & Gr) in the LM24 matrix isensured by FEMSEM microscopy. The second-order polynomial regression models and the 3D surface plots are generatedbased on the wear parameters using response surface methodology. A minimum wear rate of 0.0021 mm3/m and a minimumcoefficient of friction of 0.141 are observed experimentally
Abstract
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 bearbehaviour 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, L27orthogonal array on pin-on-disc equipment and identified optimising wear parameters in order to minimize the wear rate ofLM24-Al2O3-Gr hybrid composites. The uniform distribution of reinforcement particles (Al2O3 & Gr) in the LM24 matrix isensured by FEMSEM microscopy. The second-order polynomial regression models and the 3D surface plots are generatedbased on the wear parameters using response surface methodology. A minimum wear rate of 0.0021 mm3/m and a minimumcoefficient of friction of 0.141 are observed experimentally
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