Synthesis and Enhanced Superplasticity of the Zirconia-dispersed Alumina Nanocomposite |
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Authors: | Guoqing CHEN Kaifeng ZHANG Wenbo HAN Junting LUO |
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Affiliation: | School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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Abstract: | A series of alumina-zirconia composites with various grain sizes were prepared from the nano-sized powders with different agglomerations. Microstructural analysis of the sintered compacts indicates that the as-sintered material is a typical intra/inter granular nanocomposite with uniform distribution of the zirconia grains in the alumina matrix.Superplastic deep drawing test under different conditions demonstrates that dense Al2O3/ZrO2 samples with average grain size of 230 nm can be elongated to a dome height of at least 12 mm at the punch rate of 0.6 mm.min-1at 1400℃. Further drawing tests show that for the composites with larger grain size, such elongation cannot be achieved at such a strain rate. |
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Keywords: | Nanocomposite Synthesis Microstructure Superplasticity |
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