Abstract
The directional solidification process of SCN-3%ETH model alloy under 27.5 kHz ultrasonic vibration is studied in this paper. The results show that the interface growth is restrained because of the effect of ultrasonic vibration. The radius of curvature on the interface increases as the ultrasonic action time increase. When the ultrasonic vibration is removed from the melt, the refined cellular structure is formed. Because the impact of transient high temperature and pressure generated by the cavitation effect and stirring action of the acoustic streaming and shearing action caused by forced vibration, part of the dendrite tips are fractured. The interface growth rate decreases as the ultrasonic action time increase. Cavitation effects and high-frequency forced vibration caused by ultrasonic vibration in the melt are main reasons for interface growth rate change.
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