The coarsening kinetics of body-centered cubic Fe-Co boundary particles were examined for various [001] twist and symmetrical tilt boundaries in Cu-Fe-Co bicrystals which had been aged at 673, 698 or 723K. The particle growth obeyed the same law, regardless of the misorientation angle and the aging temperature. The measured activation energy, and calculated pre-exponential factor, for grain-boundary diffusivity as a function of misorientation exhibited several cusps. These curves were similar to those of grain-boundary energy versus misorientation angle. A lower-energy boundary was associated with a lower diffusivity, larger activation energy and higher pre-exponential factor.

Growth of BCC Fe-Co Precipitate Particles at Boundaries in Cu Bicrystals. R.Monzen, T.Echigo: Materials Science Forum, 1999, 294-296, 609-12