MICROSTRUCTURES AND PROPERTIES OF SiC_w/Al COMPOSITES

Acta Metall Sin

1988, Vol. 24

Issue (6): 499-504 DOI:

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MICROSTRUCTURES AND PROPERTIES OF SiC_w/Al COMPOSITES

GUO Shuqi;HAN Guihuan;YAO Zhongkai Harbin Institute of Technology

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GUO Shuqi;HAN Guihuan;YAO Zhongkai Harbin Institute of Technology. MICROSTRUCTURES AND PROPERTIES OF SiC_w/Al COMPOSITES. Acta Metall Sin, 1988, 24(6): 499-504.

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Abstract 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 dislocationsexist 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 reductionof the composites, the reduction in UTS due to thermal exposure at 733K beingmuch 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 therange of 11--17%.

Key words: composites SiC whisker microstructure strength

Received: 18 June 1988

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