COMPUTER-SIMULATIONS OF NI-CR-AL MULTIPHASE DIFFUSION COUPLES

A model for simulating diffusion in multiphase dispersions is here app lied to Ni-Cr-Al multiphase diffusion couples at 1200 degrees C. All s imulations are based on the assumption that the gamma-phase is continu ous throughout the whole diffusion couple with beta and/or gamma' as s econdary phases. Further, the model is incorporated into the DICTRA so ftware, which means that the simulations are based upon critically ass essed thermodynamic and kinetic data. Diffusion paths are predicted fo r several different types of diffusion couple. The simulation results are in general agreement with both experimental as well as theoretical findings and it is concluded that the present model can be applied to predict interdiffusion in important industrial applications, e.g. hig h temperature coatings. Copyright (C) 1997 Acta Metallurgica Inc.