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Al 2O 3/Al composite was fabricated by the reaction between SiO 2 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 SiO 2.The morphologies of Al 2O 3 have different features,depending on the reaction temperature.The composite has equiaxed Al 2O 3 grains when materials reacted below 1200℃,and the composite is composed of a large number of fine Al 2O 3 grains and aluminum.The composite has a frame shaped Al 2O 3 microstructure at the reaction temperature of above 1250℃.
Al 2 O 3 / Al composite was fabricated by the reaction between SiO 2 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 noted remarkably by the reaction temperature, reaction time and the quantity of SiO 2. The morphologies of Al 2O 3 have different features, depending on the reaction temperature. The composite has equiaxed Al 2O 3 grains when materials composed below 1200 ℃, and the composite is composed of a large number of fine Al 2 O 3 grains and aluminum. The composite has a frame shaped Al 2 O 3 microstructure at the reaction temperature of above 1250 ° C.