TY - JOUR
T1 - Self-diffusion along dislocations in ultra high purity iron
AU - Shima, Yumiko
AU - Ishikawa, Yukio
AU - Nitta, Hiroyuki
AU - Yamazaki, Yoshihiro
AU - Mimura, Kouji
AU - Isshiki, Minoru
AU - Iijima, Yoshiaki
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2002/2
Y1 - 2002/2
N2 - 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.
AB - 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.
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U2 - 10.2320/matertrans.43.173
DO - 10.2320/matertrans.43.173
M3 - Article
AN - SCOPUS:0036476284
VL - 43
SP - 173
EP - 177
JO - Materials Transactions
JF - Materials Transactions
SN - 0916-1821
IS - 2
ER -