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1 International Journal of Applied Mechanics and Engineering

1 2002

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Tribological behaviour of SiC particulate reinforced aluminium alloy composites in unlubricated sliding against cast iron

Gomes J. R., Miranda A. S., Rocha L. A., Crnkovic S. J., Silva V., Silva R. F.

International Journal of Applied Mechanics and Engineering

2002

Vol. 7, no 3

791-802

Functionally graded metal matrix composites (FGMMCs) are novel materials attractive for aircraft and automotive tribological components. A superior combination of surface and bulk mechanical properties may be pointed as one of the main advantages of this new material concept. In particular, through an adequate control of the ceramic particles distribution from the surface down to the core of the component, the wear resistance may be improved at the surface while global toughness is preserved. In this work, the tribological behaviour of a Al-9%Si alloy reinforced with SiC particles processed by gravity and centrifugal casting is compared. Wear tests were performed using the pin-on-disc configuration, the composite being the disc while pins were built in cast iron. Sliding speed (0.5-1.5ms-1) and disc temperature (22-300oC) were the main variables considered in the tests. Results suggest that formation of adherent iron-rich tribolayers in tests carried-out at room temperature is the main mechanism leading to an improvement of the wear resistance. For v=0.5ms-1 , this effect is enhanced in the material obtained by centrifugal casting in which the surface area fraction of particles is higher. Temperature (externally applied or due to frictional heating) degrades the tribological performance of the reinforced materials, promoting transfer of aluminium from the disc to the cast iron counterface.