Abstract
The effects of ageing and whisker-orientation on the wear behaviour of SiC w Al composites under unlubricated sliding friction have been investigated. The surface profiles of 52100 steel rings against MMC samples with different ageing treatments were also studied. The results show that the whisker orientation in an as-extruded SiC w Al composite exerts a significant influence on the wear resistance, the lowest wear rate having been observed on the specimen in which the axis of the SiC w is normal to the wear surface. Appropriate over-ageing provided the best wear resistance and resulted in milder damage to the counter ring as a consequence of reduced loss and fracture of the SiC whiskers.
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