Role of Grain-Boundary Glass Phase on the Superplastic Deformation of Tetragonal Zirconia Polycrystal |
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Authors: | Yu-ichi Yoshizawa Taketo Sakuma |
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Affiliation: | Department of Materials Science, Faculty of Engineering, The University of Tokyo, 7–3–1 Hongo, Tokyo 113, Japan |
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Abstract: | Superplastic deformation of tetragonal zirconia polycrystal (TZP) was investigated by compression test in the temperature range of 1000° to 1500°C. Special attention was paid to the role of the grain-boundary glass phase on hightemperature deformation behavior. A small addition of glass phase markedly improved the high-temperature deformability of TZP. Lithium silicate glass was much superior to aluminosilicate or lithium aluminum silicate glasses for lowering the high-temperature flow stress. The deformation mechanism was discussed on the basis of mechanical testing data and microstructural examinations. |
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Keywords: | zirconia: tetragonal polycrystals grain boundaries glass deformation superplastic |
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