Before revision: One grain may grow into another grain whilst being consumed from the other side The rate of consumption often increases when the grain is nearly consumed A curved boundary typically migrates towards its centre of curvature Driving force The boundary between one grain and its neighbour (grain boundary) is a defect in the crystal structure and so it is associated with a certain amount of energy.
After revision: One grain may grow into another grain whilst being consumed from the other side The rate of consumption often increases when the grain is nearly consumed A curved boundary typically migrates towards its centre of curvature Classical driving force The boundary between one grain and its neighbour (grain boundary) is a defect in the crystal structure and so it is associated with a certain amount of energy.