Size-dependent grain-growth kinetics observed in nanocrystalline Fe |
| |
Authors: | Krill C E Helfen L Michels D Natter H Fitch A Masson O Birringer R |
| |
Institution: | FR 7.3 Technische Phsik, Universit?t des Saarland, Saarbrücken, Germany. krill@rz.uni-sb.de |
| |
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. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|