THE KIRKENDALL EFFECT AND PHASE FORMATION KINETICS DURING SOLID STATE REACTIONS

In the article it was proved theoretically and experimentally that the interface curvature can either accelerate or slow down the Kirkendall shift and the diffusion phase layer growth in cylindrical and spherical samples when compared with a planar sample depending on the average phase concentration only. It is shown that internal stress, arising due to dilatation during phase growth, can either accelerate or slow down the growth in addition to the above-mentioned effect, depending on the difference in mobilities of different atoms within each phase and independently on the sign of dilatation.