Wear mechanisms experienced by an automotive grade

The wear mechanisms experienced by a cast hypereutectic Al-Si-Cu alloy were studied using a pin on disc tribometer, under lubricated sliding conditions at different normal loads. The microstructure of the alloy comprised primary silicon particles and intermetallic compounds dispersed in an aluminium matrix. Optical microscopy (OM) and scanning electron microscopy (SEM) coupled with energy dispersive X-rays (EDX) were used to characterize distinctive wear features after the tests. Wear of the alloy was characterized by fracture and spallation the intermetallic compounds and the primary silicon phases from the matrix. Under this test condition, the wear rate of the material corresponded to a mild wear regime. The reasons for the development of each wear mechanism and the variations of the friction coefficient of each test condition are discussed. Vol. 5 No. 3 (2015) 339 345 Wear mechanisms experienced by an automotive grade Al-Si-Cu alloy under sliding conditions Fecha de recepción: 05-02-2015 Fecha de aceptación: 25-05-2015 Palabras clave: Aluminio, aleación automotriz, mecanismos de desgaste, MEB

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