Abstract
Size distribution of primary solid particles suspended in hypoeutectic Al-Cu alloy slurry stirred rotationally under a partially solidified state is investigated. Especially, the effects of stirring rate (0.83-12.5 s−1), Cu concentration (6-20 mass%Cu) and addition of grain refiner (0.1 mass%Ti·B) on the size distribution of aggregated particles are discussed. It has been concluded that stirring under a partially solidified state determines the particle size of the primary phase by breaking up it and aggregating plural particles. Primary solid particles mostly consist of aggregated particles, and the ratio of aggregation is not strongly affected by the stirring rate and by addition of grain refiner. The size of aggregated particles decreases with increase in solid fraction and Cu concentration. On stirring at high rotation speed (12.5 s−1) or on addition of grain refiner under stirring, the size of aggregated particles becomes small at the stage of low solid fraction and scarcely decreases with increase in solid fraction. Component particles composing aggregated particles are refined with increase in solid fraction, and aggregated particles are consequently refined, too.
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