INVESTIGATION OF RAPID DIRECTIONAL SOLIDIFICATION OF AL-BASED IMMISCIBLE ALLOYS Ⅲ. EFFECT OF SOLID/LIQUID INTERFACE

Acta Metall Sin

2007, Vol. 43

Issue (6): 561-566 DOI:

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INVESTIGATION OF RAPID DIRECTIONAL SOLIDIFICATION OF AL-BASED IMMISCIBLE ALLOYS Ⅲ. EFFECT OF SOLID/LIQUID INTERFACE

Jie He;;;;;

金属研究所

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Jie He. INVESTIGATION OF RAPID DIRECTIONAL SOLIDIFICATION OF AL-BASED IMMISCIBLE ALLOYS Ⅲ. EFFECT OF SOLID/LIQUID INTERFACE. Acta Metall Sin, 2007, 43(6): 561-566 .

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Abstract The forces acting on the sphere in front of the S/L interface during the solidification of immiscible alloys have been analyzed. The dynamic criterion for the interaction mode between the sphere and solidification interface has been proposed. Combining theory with experiment, the effect of the interaction between the S/L interface and the sphere on the microstructure development in the Al-Bi based immiscible alloy has been discussed in detail. The results have indicated that the small Bi-rich spheres were repelled and accumulated in front of the solidification interface due to the combined action of the interfacial repulsion and Marangoni migration. If the interface morphology is dendritic or cellular, the Bi-rich sphere with critical size is partially entrapped by the interface and forms tadpole-type particle. While, the smaller Bi-rich spheres will be entrapped in the interdendrite and the Bi-rich particles distribute at the grain boundaries and the triple junctions after solidification.

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Received: 09 November 2006

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