Abstract
SiC whisker-reinforced Al2O3 composites, with enhanced strength and creep failure strains, have been fabricated by dispersion processing, pressure filtration and hot pressing. This method minimizes flaws that otherwise cause premature failure. High stress creep measurements demonstrate that true steady-state creep does not develop in these composites for whisker loadings above some critical level; creep rates continue to decrease with increasing creep strain. Also, an anelastic strain recovery is observed on load removal at creep remperatures. Existing creep models are inadequate to explain these observations. The development of new models for composite creep requires measurements on composites with systematically varied microstructures, which currently are being prepared.
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