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2001
Journal Article
Titel
Size-dependent grain-growth kinetics observed in nanocrystalline Fe
Abstract
Measurements of grain growth in nanocrystalline Fe reveal a linear dependence of the grain size on annealing time, contradicting studies in coarser-grained materials, which find a parabolic (or power-law) dependence. When the grain size exceeds ~ 150 nm, a smooth transition from linear to nonlinear growth kinetics occurs, suggesting that the rate-controlling mechanism for grain growth depends on the grain size. The linear-stage growth rate grees quantitatively with a model in whith a model in which boudary migration is controlled by the redistribution of excess volume localized in the boundary cores.