Highlights
An analytical model is developed to predict the cavitation induced undercooling, grain nucleation and the solidified grain size.
Cavitation bubble implosion in metallic melts were imaged in-situ by ultrafast synchrotron X-ray imaging.
The model takes into account of ultrasound input intensity, cavitation bubble size and the effect of melt temperature.
The solidified grain size of different alloys were calculated using this model and compared with the experimental data.
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