Abstract
By comparing the grain sizes under different nucleation conditions, the different nucleation mechanisms were investigated. The primitive nuclei origin at some specific interface, and subsequently disperse into the bulk melt with melt flow. The survival probability of nuclei decides the nuclei density in bulk melt, and the growth of survived nuclei finally constitutes the solidified grains. The nucleation process is highly dynamic, evolving and variable with actual experimental condition and production condition.
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