The mobility of low-angle grain boundaries in pure metals was reviewed and several theoretical treatments were provided. The approach that provides the best agreement with the available experimental data was one in which the mobility was controlled by vacancy diffusion through the bulk to (and from) the dislocations that comprise the boundary that were bowing out between pinning points. The pinning points were presumed to be extrinsic dislocations swept into the boundaries or grown in during the prior processing of the material. This approach yields a mobility that was constant with respect to misorientation angle, up to the transition to the high-angle regime. For small misorientations of the order of 1°, however, the mobility appears to increase with decreasing misorientation angle.

Mobility of Low-Angle Grain Boundaries in Pure Metals. M.Winning, A.D.Rollett, G.Gottstein, D.J.Srolovitz, A.Lim, L.S.Shvindlerman: Philosophical Magazine, 2010, 90[22], 3107-28