Phase-field investigation of multicomponent diffusion in single-phase and two-phase diffusion couples
Abbreviated Journal Title
J. Phase Equilib. Diffus.
computation; interdiffusion; microstructure; multicomponent diffusion; phase field modeling; thermodynamics; zero flux planes; ZERO-FLUX PLANES; NI-ZN SYSTEM; REVERSALS; 775-DEGREES-C; MOTION; MODEL; Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy &; Metallurgical Engineering
Interdiffusion in hypothetical ternary single-phase and two-phase diffusion couples are examined using a phase-field model by numerically solving the nonlinear Cahn-Hilliard and Ginzburg-Landau equations. For diffusion couples assembled with a regular single-phase solution, constant chemical mobilities were used to examine the development of concentration profiles including uphill diffusion and zero-flux plane. Zero-flux plane for a component was observed to develop for a diffusion couple at the composition that corresponds to the activity of that component in one of the terminal alloys. Experimental thermodynamic parameters and composition-dependent chemical mobilities were used to examine the morphological evolution of the interphase boundary in solid-to-solid, two-phase diffusion couples. Instability at the interphase boundary was introduced initially (t = 0) by a small compositional fluctuation at the diffuse interface, and its evolution varied largely as a function of terminal alloys and related composition-dependent chemical mobility.
Journal of Phase Equilibria and Diffusion
Article; Proceedings Paper
"Phase-field investigation of multicomponent diffusion in single-phase and two-phase diffusion couples" (2006). Faculty Bibliography 2000s. 6449.