Abstract
The solidification behaviour of $Fe_{82}Ge_{18}$ and $Fe_{75}Ge_{25}$ alloys is studied by using an electromagnetic levitation facility. The maximum undercooling attained in the case of $Fe_{82}Ge_{18}$ alloy is 240 K. Growth velocity of $\alpha$- (bcc) phase is measured using a photodiode technique and shows two distinct regimes. In the case of $Fe_{75}Ge_{25}$, the maximum undercooling attained is 165 K. At low undercoolings two recalescence events occur, corresponding to formation of $\alpha$- and $\Sigma$-phase $(DO_{19})$. At large undercoolings the peritectic reaction $(\alpha$ + liquid $\rightarrow\Sigma)$ is suppressed. Microstructural analysis indicates morphological changes in the microstructure as well as a competition among phases nucleating at different levels of undercooling.
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