Microstructures and mechanism of Al2O3/Al composites fabricated by the reaction between SiO2 and molten aluminum |
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| Authors: | Cheng Xiao-min Zhang Lian-meng Chen Tie-qun |
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| Affiliation: | (1) School of Materals Science and Engineering, Wuhan University of Technology, 430070 Wuhan, China;(2) South China University of Technology, China |
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| Abstract: | Al2 O3/Al composite was fabricated by the reaction between SiO2 and molten aluminum. The microstructures of the composite obtained under different reaction conditions were analyzed. The formation mechanism of the composite microstructure was discussed. Results show that the reaction kinetics is influenced remarkably by the reaction temperature, reaction time and the quantity of SiO2. The morphologies of Al2O3 have different features, depending on the reaction temperature. The composite has equaxed Al2O3 grains when materials reacted below 1200°C, and the composite is composed of a large number of fine Al2O3 grains and aluninum. The composite has a frame-shaped Al2O3 microstructure at the reaction temperature of above 1250°C. CHENG Xiao-min: Born in 1964 Funded by the National Natural Science Foundation of China (No. 91522) |
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| Keywords: | Al2O3/Al composite in-situ reaction vitreous silica microstructure |
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