Journal
PHYSICAL REVIEW LETTERS
Volume 86, Issue 5, Pages 842-845Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.842
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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 similar to 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 agrees quantitatively with a model in which boundary migration is controlled by the redistribution of excess volume localized in the boundary cores.
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