Grain boundary migration and it's mechanism of Fe-3wt%Si solid solution bicrystals

Hideharu Nakashima, Toshiyuki Ueda, Sadahiro Tsurekawa, Katsushi Ichikawa, Hideo Yoshinaga

研究成果: Contribution to journalArticle査読

1 被引用数 (Scopus)

抄録

The migration kinetics of the (221)Σ9 coincidence and random grain boundaries in Fe-3wt%Si solid solution bicrystals was experimentally studied at temperatures between 1200 and 1625K by a capillarity technique. The driving force and the mobility for the grain boundary migration was calculated from the experimental results. On the basis of the calculations, the mechanism of grain boundary migration was discussed. There are two different mechanisms of the grain boundary migration for both the grain boundaries depending on the annealing temperature and the driving force. At lower temperatures, the migrating rate is small and the mobility is about 4 times larger for the (221)Σ9 grain boundary than the random grain boundary. At these temperatures, the activation energies of the grain boundary migration for both the grain boundaries are almost the same and coincide with that of the intrinsic diffusion of Si in αFe. Thus, the rate controlling process of the grain boundary migration seems to be the dragging of solute atmosphere formed along the migrating grain boundary. On the other hand, at higher temperatures, the migrating velocity is large and the mobility is-greater for the random grain boundary than for the (221) Σ9 grain boundary. The activation energies of the grain boundary migration for both the grain boundaries are about 3/4 of those of the self diffusion in αFe. Therefore, the grain boundary migration at these temperatures is considered to be controlled by the grain boundary diffusion. The transition temperature between the two different mechanisms decreases with increasing driving force. This may be due to breaking away from the solute atmosphere for the migrating grain boundary.

本文言語英語
ページ(範囲)62-67
ページ数6
ジャーナルTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
82
3
出版ステータス出版済み - 12 1 1996

All Science Journal Classification (ASJC) codes

  • 凝縮系物理学
  • 物理化学および理論化学
  • 金属および合金
  • 材料化学

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