Interaction between particles and grain boundaries under conditions of cooperative migration

The analysis of particle grain boundary interaction is performed for dispersion hardened alloys when cooperative migration takes place. It is shown that in a general case the particle experiences a Zener force and a force of grain boundary surface tension due to boundary bending between particles. Approximate numerical estimates are made for the force acting on a particle in dispersion hardened alloy Ni-HfO2. It is noted that during cooperative migration of particle and grain boundary the velocity of the particle is directed along the resulting force. The latter equals the sum of surface tension and Zener forces. 6 refs., 2 figs