Boundary motion in bicrystals of the pure metal was monitored by means of continuous X-ray interface tracking. This method provided information on grain boundary mobility without interfering with the migration. It was found that the misorientation affected both the activation enthalpy for grain boundary motion, and the pre-exponential mobility factor. This caused an exact  = 7 boundary to move fastest at low temperatures. However, the 40.5 <111> boundary was most mobile at high temperatures. Impurities were found to reduce the grain boundary mobility by increasing the activation enthalpy for migration. The pre-exponential factor depended only slightly upon the impurity content.

D.A.Molodov, U.Czubayko, G.Gottstein, L.S.Shvindlerman: Materials Science Forum, 1996, 207-209, 133-6