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Elevated‐Temperature‐Delayed Failure of Alumina Reinforced with 20 vol% Silicon Carbide Whiskers
Author(s) -
Becher Paul F.,
Angelini Peter,
Warwick W. H.,
Tiegs Terry N.
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb05096.x
Subject(s) - whiskers , materials science , creep , cavitation , silicon carbide , composite material , fracture (geology) , whisker , carbide , deformation (meteorology) , physics , mechanics
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.