Elevated‐Temperature‐Delayed Failure of Alumina Reinforced with 20 vol% Silicon Carbide Whiskers
Authors:
- 1 January 1990
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 73 (1) , 91-96
Abstract
Alumina composites reinforced with 20 vol% SiC whiskers were exposed to applied stresses in four‐point flexure at temperatures of 1000°, 1100°, and 1200°C in air for periods of up to 14 weeks. At 1000° and 1100°C, an “apparent” fatigue limit was established at stresses of ∼ 75% of the fast fracture strength. However, after long‐term (>6 weeks) tests at 1100°C, some evidence of crack generation as a result of creep cavitation was detected. At 1200°C applied stresses as low as 38% of the 1200°C fracture strength were sufficient to promote creep deformation and accompanying cavitation and crack generation and growth resulting in failures in times of <250 h.Keywords
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