Rapid solidification behaviour of undercooled levitated Fe-Ge alloy droplets

Biswas, K. ; Phanikumar, G. ; Chattopadhyay, K. ; Volkmann, T. ; Funke, O. ; Holland-Moritz, D. ; Herlach, D. M. (2004) Rapid solidification behaviour of undercooled levitated Fe-Ge alloy droplets Materials Science and Engineering: A - Structural Materials - Properties, Microstructure and Processing, 375-37 . pp. 464-467. ISSN 0921-5093

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S09215...

Related URL: http://dx.doi.org/10.1016/j.msea.2003.10.047


The solidification behaviour of Fe82Ge18 and Fe75Ge25 alloys is studied by using an electromagnetic levitation facility. The maximum undercooling attained in the case of Fe82Ge18 alloy is 240 K. Growth velocity of α- (bcc) phase is measured using a photodiode technique and shows two distinct regimes. In the case of Fe75Ge25, the maximum undercooling attained is 165 K. At low undercoolings two recalescence events occur, corresponding to formation of α- and ε-phase (DO19). At large undercoolings the peritectic reaction (α + liquid → ε) 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:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Rapid Solidification; Undercooling; Levitation; Phase Selection; Fe-Ge
ID Code:6593
Deposited On:22 Oct 2010 06:31
Last Modified:16 May 2016 16:55

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