Kinetic cross coupling between non-conserved and conserved fields in phase field models

摘要

We present a phase field model for isothermal transformations of twocomponent alloys that includes Onsager kinetic cross coupling between thenon-conserved phase field and the conserved concentration field. We alsoprovide the reduction of the phase field model to the corresponding macroscopicdescription of the free boundary problem. The reduction is given in a generalform. Additionally we use an explicit example of a phase field model and checkthat the reduced macroscopic description, in the range of its applicability, isin excellent agreement with direct phase field simulations. The relevance ofthe newly introduced terms to solute trapping is also discussed.