Abstract
The relations describing interdiffusion and the moving of phase interfaces are derived in a multi-phase binary system where the interdiffusion coefficient \ ildeD and the partial molal volume \barVi of the diffusing components are independent of composition within each phase but show a discrete change between the two adjacent ones. An easily applicable method is presented for determining \ ildeD in a phase from the relative amounts of transfer of the two component atoms moving in or out a phase interface, which are evaluated graphically. A method of iterative approximation which is used to estimate all the rate constants of the interface motion from given initial concentrations, known concentrations at the interfaces, \ ildeD and \barVi is proposed.
