Abstract
The solubility of Al 2O 3–Ti 2O 3 is determined with X-ray diffraction analysis. On the basis of the solubility data, the precipitation from supersaturated Al 2O 3–3 mol%Ti 2O 3 solid solutions is examined. The precipitation is strongly dependent on ageing atmosphere. Coarse precipitates of Ti 2O 3 are formed in matrix after ageing at 1100°C in a reduced atmosphere of Ar–5%H 2. In contrast, intragranular nanoprecipitates of 20∼80 nm in size are generated during ageing in air at 1100°C along with fairly large grain boundary precipitates of TiO 2 with a rutile structure. The nanoprecipitates have an ordered corundum structure, and are coherent with α-Al 2O 3 matrix. Nanoprecipitation must occur in Al 2O 3–Ti 2O 3 by oxidation probably due to the very limited solubility of Ti 4+ ions in α-Al 2O 3 in comparison with Ti 3+ ions.
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