Oxidation-Induced Toughening and Strengthening of Y2O3/SiC Nanocomposites |
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| Authors: | Masashi Yoshimura Tatsuki Ohji Koichi Niihara |
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| Affiliation: | Fine Ceramics Research Association, 1-1 Hirate-cho, Kita-ku, Nagoya 462, Japan;National Industrial Research Institute of Nagoya, 1-1 Hirate-cho, Kita-ku, Nagoya 462, Japan;The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567, Japan |
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| Abstract: | Effects of oxidation on mechanical properties have been investigated for Y2O3/5 vol% SiC nanocomposite. The roomtemperature fracture strength and toughness substantially increased after oxidation around 900–1000°C for 5 h. On the other hand, little improvement was identified for specimens treated in an inert atmosphere under the same conditions. A TEM study of the oxidized specimen surfaces revealed formation of extensive residual strain contours around SiC nanoparticles. The improved strength and toughness could be caused by compressive surface stress, which was generated by volume expansion of the nanoparticles due to oxidation. |
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