| Abstract Scope |
In classical theory, during grain growth, the driving force for grain boundary motion in a bicrystal is the product of the grain boundary curvature and energy. However, recent 3D microstructure studies in both Ni and SrTiO3 polycrystals suggest that this is not valid in polycrystals. Moreover, the grain boundary velocity can be calculated by the product of grain boundary mobility (M) and driving force (ΔF). The driving force (ΔF) can be determined by the stiffness tensor (Γ) and curvature matrix (κ). In this talk, based on the synchrotron-based measurement of Ni polycrystals, the correlations between grain boundary properties (plane, curvature, energy, stiffness, velocity, ‘driving force’) in the five parameter spaces are discussed. We observed that at fixed misorientation, the product of stiffness tensor and curvature shows is sometimes correlated to the grain boundary velocity. The observation implies that it is necessary to consider interfacial stiffness to understand grain boundary migration. |