Grain boundary migration was studied, in bi-crystals with [001] tilt boundaries having various angles, by using the Sun-Bauer technique and the constant driving force method. Experimentally observed and theoretically predicted shapes of the grain boundaries were compared for the Sun-Bauer geometry. The effect of impurity drag was taken into account when calculating the grain boundary shape. The interface mobility was determined at temperatures ranging from 1217 to 1377K, and  in situ  observations of the fastest-migrating boundary revealed a linear relationship between grain-boundary velocity and driving force. The activation enthalpies and the logarithms of the pre-exponential factors, for the various types of tilt boundary, were linearly related. That is, they exhibited the compensation effect. The results were in good agreement with published data on grain boundary mobility in Fe-3%Si bi-crystals.

Grain Boundary Migration in Fe-3.5%Si Bicrystals with [001] Tilt Boundaries M.Furtkamp, G.Gottstein, D.A.Molodov, V.N.Semenov, L.S.Shvindlerman: Acta Materialia, 1998, 46[12], 4103-10