Rev.Adv.Mater.Sci. (RAMS)
No 5, Vol. 18, 2008, pages 439-443

N-SITU OBSERVATION OF SOLIDIFICATION BEHAVIOUR FROM UNDERCOOLED α-Fe2Si5
MELT USING AN ELECTROMAGNETIC LEVITATOR

Kiyoshi Nozaki, Kosuke Nagashio and Kazuhiko Kuribayashi

Abstract

Fe2Si5 melts were deeply undercooled using an electromagnetic levitator and their growth velocity was measured by a high speed video camera in order to reveal the solidification behavior of intermetallic compounds. The growth morphology drastically changed depending on the undercooling, ΔT . The faceted planes were observed on the surface of the sample at ΔT ≤ ∼ 50K. With increasing undercoolings, the morphology changed into typical facet dendrite. Especially at the high undercooling of ΔT ≤ ∼100K, a dendrite of hexagonal symmetry clearly formed. The growth velocities were measured as a function of undercooling and compared with the classical dendritic growth theory. The interfacial kinetics is thought to be crucial for the solidification of Fe2Si5.

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