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Visualization of freckle formation induced by forced melt convection in solidifying GaIn alloys

2010; Elsevier BV; Volume: 64; Issue: 12 Linguagem: Inglês

10.1016/j.matlet.2010.03.044

1873-4979

Stephan Boden, Sven Eckert, G. Gerbeth,

nanoparticles nucleation surface interactions

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.