Enhanced diffusion of Au in γ-Fe by vacancies induced under elevated hydrogen pressure

Yoshihiro Yamazaki, Yoshiaki Iijima, Masuo Okada

研究成果: Contribution to journalArticle査読

24 被引用数 (Scopus)

抄録

The diffusion coefficients of Au, DAu*, in γ-Fe in the temperature range from 1263 to 1653 K at 0.1 MPa Ar and from 1207 to 1351 K at 3-5 GPa H2 have been determined by relating the interdiffusion coefficients in single-phase Fe/Fe-Au couples with the Darken-Manning relation. The value of DAu* in γ-Fe at 5 GPa H2 is 2-3 times larger than that at 0.1 MPa Ar. The temperature dependence of D Au* in γ-Fe at 0.1 MPa Ar and at 5 GPa H2 can be expressed as DAu*=8.1-2.3 +3.2×10-5exp{-(290±4)kJmol-1/RT} m2 s-1 and DAu*=1.4×10 -3exp(-310kJmol-1/RT) m2 s-1, respectively. The value of the activation energy at 5 GPa H2 is 20 kJ mol-1 larger than that at 0.1 MPa Ar, whereas the value of the pre-exponential factor at 5 GPa H2 is 17 times larger than that at 0.1 MPa Ar. Therefore, the enhancement of the diffusion at 5 GPa H2 is attributed to a high value of activation entropy.

本文言語英語
ページ(範囲)1247-1254
ページ数8
ジャーナルActa Materialia
52
5
DOI
出版ステータス出版済み - 3 8 2004
外部発表はい

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • ポリマーおよびプラスチック
  • 金属および合金

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