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- W1963555770 abstract "Fully dense fine-grained 32.6-vol%-zirconia-toughened alumina composites have been fabricated from nanocrystalline rapidly solidified material. A model considering the thermodynamics of the constrained t-ZrO2m-ZrO2 phase transformation was developed for this percolated two-phase material. This analysis indicated that the grain size at which this phase transformation is thermodynamically favorable was 1.26 µm in a composite that contained 32.6 vol% ZrO2 and was stabilized with 1.50 mol% Y2O3. These results of the model compared favorably with experimental results, showing that grains of this size could be retained after heating to temperatures of as high as 1600°C. The rapidly solidified precursor was ball-milled into submicrometer powder and centrifugally cast into green specimens that were pressureless sintered to full density at temperatures as low as 1500°C. A composite containing nearly 100%t-ZrO2 was produced by pressureless sintering at 1500°C and a composite containing 45 vol%t-ZrO2/55 vol%m-ZrO2 was obtained by sintering at 1600°C. The resulting two-phase microstructures contained uniformly distributed, micrometer-size grains whose sizes are consistent with the facilitation of transformation and microcrack toughening." @default.
- W1963555770 created "2016-06-24" @default.
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- W1963555770 date "2005-01-21" @default.
- W1963555770 modified "2023-09-26" @default.
- W1963555770 title "Modeling and Fabrication of Fine-Grain Alumina-Zirconia Composites Produced from Nanocrystalline Precursors" @default.
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- W1963555770 doi "https://doi.org/10.1111/j.1151-2916.1998.tb02547.x" @default.
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