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Experimental study of the planar-to-cellular transition during thin-film directional solidification: Observations of the long-time-scale dynamics of microstructure formation.

The morphological evolution of the crystal-melt interface formed during the thin-film directional solidification of the succinonitrile-acetone alloy is studied using an experimental system that permits extremely-long-time-scale experiments under conditions close to those for the onset of cellular growth from the planar interface. Long exposure times of the alloy to high temperatures result in thermal decomposition of the succinonitrile, which increases the total concentration of solute or impurity in the sample. This effect alone may be responsible for the apparent hysteresis observed by others in the measurement of the critical solidification rate V c for the onset of cellular growth and may explain the differences between those experiments and numerical calculations