Size-dependent grain-growth kinetics observed in nanocrystalline Fe

被引：174
作者：
Krill, CE
Helfen, L
Michels, D
Natter, H
Fitch, A
Masson, O
Birringer, R
机构：
[1] Univ Saarland, FR Tech Phys 7 3, D-66041 Saarbrucken, Germany
[2] Univ Saarland, FR Phys Chem 8 13, D-66041 Saarbrucken, Germany
[3] European Synchrotron Radiat Facil, F-38043 Grenoble, France
来源：
PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 05期
关键词：
D O I：
10.1103/PhysRevLett.86.842
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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.
引用
收藏
页码：842 / 845
页数：4
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