Journal
MATERIALS LETTERS
Volume 64, Issue 12, Pages 1340-1343Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2010.03.044
Keywords
Directional solidification; Dendritic growth; Convection; Segregation; X-ray radioscopy
Funding
- Deutsche Forschungsgemeinschaft (DFG) [SFB 609]
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A bottom-up solidification of a Ga-25 wt.%In alloy under the influence of buoyancy-driven and electromagnetically driven convection was investigated by X-ray radioscopy. The main effect of the flow on the solidification is determined by the flow-induced redistribution of solute concentration which results in a change of the growth direction of the dendrites and the preference of secondary branches for an accelerated or decelerated growth. The experiments demonstrate clearly how the interdendritic flow contributes to the formation of spacious segregation freckles. (C) 2010 Elsevier B.V. All rights reserved.
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