Abstract
When a liquid becomes highly supercooled, the crystal phases that nucleate from it may be one of several alternatives other than the primary crystallization phase. Even though these crystal phases would be metastable at the liquidus temperature of the primary crystallization phase, they may or may not be the most stable crystal phase at the nucleation temperature. Thus the term “metastable phase” is not generally applicable and the name “alternative crystallization phase” (ACP) is used.In order to determine whether a particular crystal phase may nucleate in a supercooled liquid, it is not sufficient to determine simply which phase has the greater liquidus temperature. The effect of liquid supercooling (relative to the liquidus temperature of each phase) on the nucleation of each possible phase must be considered. For a given situation (eg. liquid volume, cooling rate,…), the propensity of a given phase for nucleating from the supercooled liquid can be gauged by calculating a nucleation temperature for that phase [1].
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