The steady-state motion of grain boundary systems with triple junctions was analysed with regard to experimental data on tricrystals. It was demonstrated that the vertex angle at the triple junction could deviate appreciably from the equilibrium value when a low mobility of the triple junction produced a drag on grain boundary motion. A transition from triple-junction kinetics to grain-boundary kinetics was observed. There was experimental evidence that, in triple-junction motion, the pre-exponential factor changed linearly with the activation enthalpy (compensation effect).

Effect of Triple Junctions on Grain Boundary Migration. V.G.Sursaeva, U.Czubayko, G.Gottstein, L.S.Shvindlerman: Materials Science Forum, 1999, 294-296, 517-20