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Morphological Transition in High Growth Rate in Constrained Solidification

In the constrained solidification of alloy, morphology changes according to the growth rate from planar interface to cellular one, from cellular to dendrite, from dendrite to cellular, and cellular to planar interface. Morphology of transition from cellular to dendrite is well studied experimentally and theoretically, but the transition from dendrite to cellular interface is poorly studied, despite of its importance in engineering. One of the experimental difficulties is involved in realizing steady solidification under given temperature gradient. In this work the morphological transition from dendrite to cellular interface is studied in the solidification of SCN-dilute acetone alloy.