THE KINETICS OF INTERFACE-DIFFUSION- CONTROLLED REACTION IN LAMELLAR EUTECTOIDS AND REACTIVE MULTILAYERS

摘要

We consider the solid state reactions α + β→ω and ω→α+βat sufficiently low temperatures so that volume diffusion is negligible and interphase boundary diffusion is rate control1ing. Thc participat- ing phases are assumed to have fixed compositions. The existence of a steady state reaction front (one which propagates with constant velocity and shape) is possible only for certain imposed conditions (e.g. for a range of driving forces). An analytical solution of the problem is given for the small slope approxi- mation, and numerical solutions are investigated for the general case. Multiple solutions and re-entrant shapes are found for certain conditions. Possible applications of the present treatment include intermediate