The [100] symmetrical tilt grain boundaries were found to exhibit a pronounced anisotropy of the activation enthalpy for migration, in that it was high for special boundaries as compared with others. This was explained, in terms of an extended version of the Gottstein-Shvindlerman model, by supposing that there were 3 main contributions to the migration enthalpy. These were the intrinsic migration enthalpy, a migration enthalpy that resulted from grain boundary segregation, and a migration enthalpy that resulted from alloy mixing. It was shown that the differences in migration enthalpy of special and general grain boundaries in a concentrated alloy reflected the predominant effect of intrinsic migration enthalpy over weakened segregation effects.

P.Lejcek, J.Adámek: Journal de Physique III, 1995, 5[C3], 107-14