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Abstract
The fracture mechanical properties of SiC particle reinforced Al 2O 3 matrix composites were investigated at room temperature and T=1200°C. The results showed that the fracture strength and toughness of composites are enhanced, compared with those of monolithic Al 2O 3, especially at elevated temperature, and the strength and toughness of composites increase with the increase in the content of SiC particles. It was found that the improvement in fracture mechanical properties of composites is due to the fracture mode transformation from intergranular in monolithic Al 2O 3 to transgranular in the composites, and the fracture mode change might result mainly from the pinning effect of SiC particles on the Al 2O 3 boundaries. The study on flexure creep behavior of monolithic Al 2O 3 and the composites with 20 vol% SiC particles at T=1260°C indicated that the composites also exhibited some improvement in their creep resistance, compared to the creep behavior of monolithic Al 2O 3, due to the pinning effect of SiC particles at Al 2O 3 grain boundaries on grain boundary sliding during creeping.
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