The main objective of present work focuses to investigate the tribological behavior of Al 7075 hybrid metal matrix composite. Al 7075 metal matrix composites has many potential applications especially in automotive and aerospace industries, due to their light weight to strength ratio and high wear resistance. The composite is fabricated using two step stir casting process by varying 5% to 15% volume fractions of Silicon Carbide and Titanium Carbide. Optical microstructure showed reinforcement distribution into Al 7075 matrix. The wear and frictional properties of the hybrid metal matrix composites was studied by performing dry sliding wear test using a pin-on-disc wear tester. Tribological behaviors were examined by applying different normal loads of 10N, 20N, 30N with different sliding velocities (1m/s, 2m/s, 3m/s) at room temperature without lubrication. Wear rate and coefficient of friction for different normal load and sliding velocities were plotted and studied. The micro hardness value of AST15 was higher by 18.8% than the AST0 Composites. The wear rate prediction indicated the wear rate for AST15 as 2.1×10−3mm³/m as compared to AST0 which was 6.4×10−3mm³/m. The wear rate increases with the increase in load and sliding velocities. Scanning electron microscopy micrographs of the worn surface are used to predict the nature of the wear mechanism.

中文翻译：

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AL 7075-(SiC/TiC)混合金属基复合材料的干滑动磨损行为研究

目前工作的主要目的是研究 Al 7075 杂化金属基复合材料的摩擦学行为。Al 7075 金属基复合材料具有许多潜在的应用，特别是在汽车和航空航天工业中，因为它们具有轻质强度比和高耐磨性。该复合材料是使用两步搅拌铸造工艺制造的，通过改变 5% 至 15% 的碳化硅和碳化钛的体积分数。光学微观结构显示强化分布在 Al 7075 基体中。通过使用销盘磨损试验机进行干滑动磨损试验，研究了混合金属基复合材料的磨损和摩擦性能。通过施加 10 个不同的法向载荷来检查摩擦学行为ñ，20ñ，30N 具有不同的滑动速度（1米/秒，2米/秒，3m/s) 在室温下无润滑。绘制并研究了不同法向载荷和滑动速度下的磨损率和摩擦系数。AST15的显微硬度值比AST0复合材料高18.8%。磨损率预测表明 AST15 的磨损率为2.1×10-3mm ³ /m 与 A​​ST0 相比6.4×10-3毫米³ /米。磨损率随着载荷和滑动速度的增加而增加。磨损表面的扫描电子显微镜显微照片用于预测磨损机制的性质。