Phase-transformation and grain-growth kinetics in yttria-stabilized tetragonal zirconia polycrystal doped with a small amount of alumina |
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Authors: | Koji Matsui Hidehiro Yoshida Yuichi Ikuhara |
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Affiliation: | 1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China;2. Department of Materials Science & Engineering, University of California, Davis, CA 95616, USA |
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Abstract: | Microstructure development during sintering in 3 mol% Y2O3-stabilized tetragonal zirconia polycrystal doped with a small amount of Al2O3 was investigated in the isothermal sintering conditions of 1300–1500 °C. At the low sintering temperature at 1300 °C, although the density was relatively high, the grain-growth rate was much slow. In the specimen sintered at 1300 °C for 50 h, Y3+ and Al3+ ions segregated along grain boundaries within the widths of about 10 and 6 nm, respectively. In grain interiors, the cubic-phase regions were formed by not only a grain-boundary segregation-induced phase-transformation mechanism but also by spinodal decomposition. The grain-growth behavior was kinetically analyzed using the grain-size data in 1300–1500 °C, which indicated that the grain-growth rate was enhanced by Al2O3-doping. These phase-transformation and grain-growth behaviors are reasonably explained by the diffusion-enhanced effect of Al2O3-doping. |
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