Rapid solidification behaviour of undercooled levitated Fe–Ge alloy droplets

Biswas, K and Phanikumar, G and Chattopadhyay, K and Volkmann, T and Funke, O and Holland-Moritz, D and Herlach, DM (2004) Rapid solidification behaviour of undercooled levitated Fe–Ge alloy droplets. In: Materials Science and Engineering A, 375-37 . pp. 464-467.

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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.

Item Type:	Journal Article
Publication:	Materials Science and Engineering A
Publisher:	Elsevier
Additional Information:	The copyright belongs to Elsevier
Keywords:	Rapid solidification;Undercooling;Levitation;Phase selection;Fe–Ge
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	25 Apr 2006
Last Modified:	19 Sep 2010 04:25
URI:	http://eprints.iisc.ac.in/id/eprint/6405

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