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Isothermal holding of an Al-19% Si-0.02%P alloy has been carried out at 893K to determine the rate of Ostwald ripening of primary silicon crystals in aluminum melt. The average radius of these crystals during isothermal holding is expressed by an equation; R3-R30=kt, where a constant k is determined as 1.6×10-12cm3/s. When a specimen is solidified at a constant cooling rate of ΔT/Δt, solidification growth and Ostwald ripening take place simultaneously. Such a solidification

Ostwald Ripening and Solidification Growth of Primary Silicon Crystals during Solidification of an Al-19%Si-0.02%P Alloy