MICROSTRUCTURES AND PROPERTIES OF SiC_w/Al COMPOSITES
SiC_w/Al复合材料的微观结构与性能

This paper presents an investigation on the microstructures and prop- erties of the 17V.-% SiC_w/ZL109Al composites. TEM observations and EDAX ana- lysis revealed that aluminium diffuses into the SiC whiskers and that dislocations exist at the whisker/matrix interfaces. Tensile test results showed that the isother- mal exposure and thermal cycle at both 573K and 733K caused the UTS reduction of the composites, the reduction in UTS due to thermal exposure at 733K being much more significant than that due to thermal cycle at the same temperature. The SiC_w/ZL109Al composites were also found to have exellent wear resistance, which does not seem to vary much with the volume content of whiskers in the range of 11--17%.