A combination of in situ annealing and electron back-scattering diffraction in the scanning electron microscope was used to determine the mobility of high-angle grain boundaries in deformed single-phase alloy samples. It was found that the boundary velocity was directly proportional to the driving pressure, and that the activation energy for boundary migration under all of the present conditions was consistent with control by lattice diffusion of the solute. It was confirmed that the tilt boundaries of recrystallized grains which were misoriented by 40º about axes within 10º of (111) had an increased mobility when compared with other high-angle boundaries, whereas the mobilities of 40º (111) twist boundaries were similar to those of general high-angle boundaries. The mobility maximum for the 40º (111) tilt boundaries was very broad; in contrast to the sharp mobility peaks which had been reported for curvature-driven grain growth.

Measurements of Grain-Boundary Mobility during Recrystallization of a Single-Phase Aluminium Alloy. Y.Huang, F.J.Humphreys: Acta Materialia, 1999, 47[7], 2259-68