title: 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 approximately 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.
authors.affiliation: FR 7.3 Technische Phsik, Universität des Saarland, Saarbrücken, Germany. krill@rz.uni-sb.de
authors.forename: C E
authors.initials: CE
authors.lastname: Krill
authors.forename: L
authors.initials: L
authors.lastname: Helfen
authors.forename: D
authors.initials: D
authors.lastname: Michels
authors.forename: H
authors.initials: H
authors.lastname: Natter
authors.forename: A
authors.initials: A
authors.lastname: Fitch
authors.forename: O
authors.initials: O
authors.lastname: Masson
authors.forename: R
authors.initials: R
authors.lastname: Birringer