Effect of grain morphology and grain size on the mechanical properties of Al2O3 ceramics |
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Authors: | Takashi Koyama Akio Nishiyama Koichi Niihara |
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Affiliation: | (1) Central Research Institute, Mitsubishi Materials Corporation, 1-297 Kitabukuro-cho, Omiya, 330 Saitama, Japan;(2) The Institute of Scientific and Industrial Research (ISIR), Osaka University, 8-1 Mihogaoka, Ibaraki, 567 Osaka, Japan |
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Abstract: | Bending strength, fracture toughness, fracture energy and crack extension resistance were evaluated for Al2O3 ceramics with equi-axed and platelet grains. Bending strength was proportional to grain size–1/2, but flaws with a size of 10 m controlled the strength when the microstructure was finer than 10 m. Fracture toughness, measured by the single etched precracked beam (SERB) method, was proportional to fracture energy1/2, and increased with the grain size of Al2O3 ceramics with equi-axed and platelet grains. However, the toughness of platelet grain ceramics was higher than the ceramics with equi-axed grains, and increased up to 6.6 MPam1/2 with grain size. Therefore, it is thought that fracture toughness not only depends on grain size, but also on grain morphology; equations were derived to account for this phenomenon. |
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