Rapid solidification behaviour of undercooled levitated Fe–Ge alloy droplets
✍ Scribed by K. Biswas; G. Phanikumar; K. Chattopadhyay; T. Volkmann; O. Funke; D. Holland-Moritz; D.M. Herlach
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 405 KB
- Volume
- 375-377
- Category
- Article
- ISSN
- 0921-5093
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✦ Synopsis
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 ␣-(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 ␣and ε-phase (DO 19 ). At large undercoolings the peritectic reaction (␣ + 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.