Creep of Oxide Single Crystals
Final rept. Sep 87-Sep 89,
GE CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY NY
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The constant-load compressive creep behavior of single crystals of yttria-stabilized zirconia, thoria, yttrium-aluminum garnet, beryllia, alumina and silicon carbide were determined. Of the materials tested, yttrium-aluminum garnet was judged to be the best candidate for reinforcement fiber development due to its good creep resistance, low anisotropy and inherent oxidation resistance. C-axis aligned beryllia is also expected to have very good creep resistance however, severe creep anisotropy caused by easy basal slip may limit its usefulness as a reinforcement. Data from this study and from the literature suggests that the creep resistance of cubic oxide single crystals improves as the size of the glissile dislocation Burgers vector increases.