Free dendritic growth

Abstract Free dendritic growth refers to the unconstrained development of crystals within a supercooled melt, which is the classical “dendrite problem”. Great strides have been taken in recent years in both the theoretical understanding of dendritic growth and its experimental status. The development of this field will be sketched, showing that transport theory and interfacial thermodynamics (capillarity theory) were insufficient ingredients to develop a truly predictive model of dendrite formation. The convenient, but incorrect, notion of “maximum velocity” was used for many years to estimate the behavior of dendritic transformations until supplanted by modern dynamic stability theory. The proper combinations of transport theory and morphological stability seem to be able to predict the salient aspects of dendritic growth, especially in the neighborhood of the tip. The overall development of cast microstructures, such as equiaxed zone formation, rapidly solidified microstructures etc., also seems to contain additional non-deterministic features which lie outside the current theories discussed here.

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