Restricted applicability of Onsager’s reciprocity relations to models of interface motion

Kaplan, Theodore; Aziz, M. J.; Gray, L. J.
November 1993
Journal of Chemical Physics;11/15/1993, Vol. 99 Issue 10, p8031
Academic Journal
Onsager’s reciprocity relations have been applied to the motion of a planar interface in a phase transformation in a two-component system, in order to provide a test of kinetic models of alloy solidification. Although applicable to such models in general, Onsager’s relations yield no information for a subclass of models in which the thermodynamic driving forces are linearly dependent to first order, as is the case for several models of alloy solidification including the continuous growth model (CGM) of Aziz and Kaplan. As a consequence, experimental tests will likely be required to distinguish between these models. If the CGM is generalized to include diffusion in the growing phase, Onsager’s relations are applicable under some circumstances.


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