Development of Sono-solidification Process with Hyperpressure Based on Acoustic Cavitation

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The present study is focused on sono-solidification with acoustic cavitation in hypereutectic Al-Si alloy. During the sono-solidification of hypereutectic Al-Si alloy, non-equilibrium ・-Al grains crystallize before reaching the eutectic temperature, in addition to the refined primary silicon grains. Non-equilibrium ・・-Al nuclei are crystallized at collapsed cavitation bubble sites and they are dispersed throughout the billet due to acoustic streaming. Acoustic cavitation also leads to the generation of inhomogeneous nuclei, that is, cavitation bubbles, so that a large number of inhomogeneous nuclei of cavitation bubbles causes the grain refinement of primary silicon even above the liquidus temperature.