|About this Abstract
||Materials Science & Technology 2012
||Phase Stability, Diffusion, Kinetics and their Applications (PSDK-VII)
||Bi-Velocity Phase Field Method; Diffusion and Reactions in Ni-Cr-Al System and Internal Oxidation of the Noble Metal Containing Alloys
||Marek Danielewski, Bartek Wierzba, Katarzyna Tkacz-Smiech, Andrzej Nowotnik
|On-Site Speaker (Planned)
An approach to the problem of interdiffusion in multicomponent-multiphase system is presented. It couples bi-velocity (Darken) method, in which the mass conservation and volume continuity laws are considered, with the phase field method. It is a generalization of the models based on the diffusion equation implemented e.g., in Dictra. The proposed bi-velocity phase field method allows computing the kinetics of the process, diffusive mass transport in every phase, concentration profiles, diffusion paths, and Kirkendall effect. The example results presented here are the fundamental problems concerning the reactive diffusion at high temperatures in Al-Cr-Ni alloys and the internal oxidation in Ni-Pt-O ternary system. It is a starting point that will allow modeling the coating composition to reduce interdiffusion and stabilize a desired microstructure, i.e., to extend coating life time.