Diffusion of tungsten in α-iron

S. Takemoto, H. Nitta, Y. Iijima, Y. Yamazaki

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

Tracer diffusion coefficient of 181W in -iron has been determined in the temperature range between 833 and 1173 K using a serial sputter-microsectioning method. The temperature dependence of the diffusion coefficient, D, over the whole temperature range of -iron across the Curie temperature (TC = 1043 K), can be expressed by [image omitted] where s is the ratio of the spontaneous magnetization at T K to that at 0 K. The factor 0.086 in the above equation is smaller than 0.156 for the self-diffusion, showing that the influence of the magnetic transformation on the diffusion of tungsten in -iron is smaller than that on the self-diffusion. The activation energy 287 kJ/mol for tungsten diffusion in the paramagnetic iron is much higher than 250.6 kJ/mol for the self-diffusion. Atomic size effect is predominant in the activation energies for diffusion of transition elements in the paramagnetic -iron.

Original languageEnglish
Pages (from-to)1619-1629
Number of pages11
JournalPhilosophical Magazine
Volume87
Issue number11
DOIs
Publication statusPublished - Apr 1 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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