Schematic Presentation for Dual Solidification Mechanisms of a Liquid Ternary Fe-Cu-Sn Alloy (IMAGE)
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(0.19TL), gFe dendrites display a growth velocity of only 100 mm/s. The reduction of dendritic growth velocity is caused mainly by two factors: (1) the solute diffusion speed is slowed down if bulk undercooling is continually increased, and (2) the tiny Cu-rich globules formed by phase separation may hinder the progression of the solid/liquid interface. However, it should be noted that the absolute values of dendritic growth velocity are one order of magnitude larger than those at the moderate undercooling range, although the latter case shows an increasing tendency of dendritic growth velocity.
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