Self-diffusion along dislocations in ultra high purity iron

Yumiko Shima, Yukio Ishikawa, Hiroyuki Nitta, Yoshihiro Yamazaki, Kouji Mimura, Minoru Isshiki, Yoshiaki Iijima

研究成果: Contribution to journalArticle査読

49 被引用数 (Scopus)

抄録

Self-diffusion along dislocations in ultra high purity iron containing 0.5-1.2 mass ppm carbon, 0.1-1.0 mass ppm nitrogen and 1.8-4.0 mass ppm oxygen has been studied by the radioactive tracer method with the sputter-microsectioning technique. Below 700 K, the self-diffusion coefficient along dislocations has been determined directly from the type C kinetics classified by Harrison, whereas above 800 K it has been obtained by the type B kinetics assuming that the effective radius of dislocation pipe is equal to 5 × 10-10 m. The temperature dependence of the self-diffusion coefficient along dislocations does not show a linear Arrhenius relation. Below 900 K the Arrhenius plot shows slightly downward curvature. However, above 900 K the self-diffusion coefficient along dislocations increases remarkably with increasing temperature. The value at 900 K is 10-14 m2s-1, while it takes 10-10 m2s-1 at the Curie temperature (1043 K). It seems that the steep increase of the self-diffusion coefficient along dislocations near the Curie temperature is related to the magnetic transformation in ultra high purity iron.

本文言語英語
ページ(範囲)173-177
ページ数5
ジャーナルMaterials Transactions
43
2
DOI
出版ステータス出版済み - 2 2002
外部発表はい

All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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