Strengthening and Toughening of Silicon Nitride by Superplastic Deformation |
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| Authors: | Naoki Kondo Tatsuki Ohji Fumihiro Wakai |
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| Affiliation: | National Industrial Research Institute of Nagoya Hirate-cho, Kita-ku, Nagoya, Aichi 462, Japan;Materials and Structures Laboratory, Tokyo Institute of Technology Nagatsuta, Midori-ku, Yokohama, Kanagawa 226, Japan |
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| Abstract: | Mechanical properties of silicon nitride which was superplastically deformed in plane-strain compression were investigated. Superplastically deformed silicon nitride exhibited a highly anisotropic microstructure, where rod-shaped grains tended to be aligned along the extruding direction. The bending strength and fracture toughness were increased substantially by the deformation process when a stress was applied in the extruding direction. It appears that these improvements were mainly due to effective operation of grain bridging and pull-out by the grain alignment. |
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