| Abstract: | Analysis of dispersoid formation and stability indicates that in-situ formation of an adequate volume fraction of fine particles can be thermodynamically incompatible with stability against high-temperature coarsening. The theory of particle coarsening is extended to include the effects of grain boundaries and dislocations. Theoretical analysis predicts that particle dragging by migrating grain boundaries combined with enhanced coarsening by grain boundary diffusion can give denuded regions near grain boundaries. These predictions of enhanced coarsening and particle dragging are in accord with experimental observations on α-Ti and Ti3Al based alloys. |
