Abstract
It is well known that external fields applied to melts can cause nucleation at lower supercoolings, fragmentation of growing dendrites, and forced convection around the solidification front. All these effects contribute to a finer microstructure of solidified material. In this article, we analyze how the pressure field created with ultrasonic vibrations influences structure refinement in terms of supercooling. It is shown that only high cavitation pressures of the order of 104 atmospheres are capable of nucleating crystals at minimal supercoolings. We demonstrate the possibility of sononucleation even in superheated liquid. Simulation and experiments with water samples show that very high cavitation pressures occur in a relatively narrow zone where the drive acoustic field has an appropriate combination of pressure amplitude and frequency. In order to accurately predict the microstructure formed by ultrasonically assisted solidification of metals, this article calls for the development of equations of state that would describe the pressure-dependent behavior of molten metals.
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Acknowledgment
The authors gratefully acknowledge financial support from the National Science Foundation of China (Grant No. 51320105003).
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Eighth International Conference on Physical and Numerical Simulations of Materials Processing—ICPNS 2016 symposium.
Manuscript submitted December 21, 2016.
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Rakita, M., Han, Q. Influence of Pressure Field in Melts on the Primary Nucleation in Solidification Processing. Metall Mater Trans B 48, 2232–2244 (2017). https://doi.org/10.1007/s11663-017-1029-2
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DOI: https://doi.org/10.1007/s11663-017-1029-2