Compressive Creep of SiC-Whisker-Reinforced Al2O3 |
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| Authors: | Antonio R de Arellano-López Francisco L Cumbrera Arturo Domínguez-Rodríguez Kenneth C Goretta Jules L Routbort |
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| Affiliation: | Departmento de Física de la Materia Condensada, Universidad de Sevilla, Sevilla, Spain;Materials and Components Technology Division, Argonne National Laboratory, Argonne, Illinois 60439;Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 |
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| Abstract: | Compressive creep of SiC-whisker-reinforced Al2O3 composites (0, 5, 15, and 25 wt% SiC) was measured in the temperature range of 1300° to 1500°C in air and argon. The creep resistance increased with increasing whisker concentration. The results indicated that the whiskers degraded in air, increasing strain rates compared to those in argon. Stress exponents between 1.0 and 2.0 and an activation energy of 620 ± 100 kJ/mol were measured. Transmission electron microscopy observations indicated that cavitation was minimal and that the deformed composites had the same dislocation structure as did the as-received samples. |
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| Keywords: | creep whiskers silicon carbide alumina composites |
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