Can the grain boundary stiffness driving force explain observed grain boundary migration rates in polycrystals?

The anisotropic grain boundary stiffness driving force is compared to observed grain boundary migration rates in Ni polycrystals for five grain boundary disorientations. Although the stiffness driving force is better correlated to observed migration rates than the curvature driving force, neither correlation is strong. These findings might be the result of a limitation in the theory for grain boundary migration, which treats grain boundaries as independent microstructural entities and ignores the constraints imposed by their connections to other boundaries at triple lines.