Hydrogen-induced superabundant vacancies and diffusion enhancement in some FCC metals

Y. Fukai, T. Haraguchi, E. Hayashi, Yasuyuki Ishii, Y. Kurokawa, J. Yanagawa

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Lattice contractions caused by the formation of extremely high concentrations of vacancies (superabundant vacancies of ∼10 at.%) were observed in the fcc phases of Mn-H, Fe-H, Co-H, Ni-H and Pd-H samples at high temperatures ( ≦900°C ) and high H2 pressures ( ≦ 5 GPa). Comprehensive measurements in the Pd-H system, analyzed in terms of our theory of vacancy- hydrogen ( Vac-H ) cluster formation, have allowed to determine the formation and migration properties of the Vac-H clusters. From the observed lattice contraction process and concomitant diffusion enhancement, it is concluded that most Vac-H clusters are introduced by diffusion from the surface over a long time but some of them are created instantly at internal sources.

Original languageEnglish
Pages (from-to)1063-1068
Number of pages6
JournalDefect and Diffusion Forum
Issue number194-199 PART 2
Publication statusPublished - 2001
Externally publishedYes

Fingerprint

Vacancies
Hydrogen
Metals
augmentation
hydrogen
metals
Crystal lattices
contraction
Temperature

Keywords

  • Diffusion Enhancement
  • FCC Metals
  • Superabundant Vacancies
  • Vacancy-Hydrogen Cluster

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

Fukai, Y., Haraguchi, T., Hayashi, E., Ishii, Y., Kurokawa, Y., & Yanagawa, J. (2001). Hydrogen-induced superabundant vacancies and diffusion enhancement in some FCC metals. Defect and Diffusion Forum, (194-199 PART 2), 1063-1068.

Hydrogen-induced superabundant vacancies and diffusion enhancement in some FCC metals. / Fukai, Y.; Haraguchi, T.; Hayashi, E.; Ishii, Yasuyuki; Kurokawa, Y.; Yanagawa, J.

In: Defect and Diffusion Forum, No. 194-199 PART 2, 2001, p. 1063-1068.

Research output: Contribution to journalArticle

Fukai, Y, Haraguchi, T, Hayashi, E, Ishii, Y, Kurokawa, Y & Yanagawa, J 2001, 'Hydrogen-induced superabundant vacancies and diffusion enhancement in some FCC metals', Defect and Diffusion Forum, no. 194-199 PART 2, pp. 1063-1068.
Fukai Y, Haraguchi T, Hayashi E, Ishii Y, Kurokawa Y, Yanagawa J. Hydrogen-induced superabundant vacancies and diffusion enhancement in some FCC metals. Defect and Diffusion Forum. 2001;(194-199 PART 2):1063-1068.
Fukai, Y. ; Haraguchi, T. ; Hayashi, E. ; Ishii, Yasuyuki ; Kurokawa, Y. ; Yanagawa, J. / Hydrogen-induced superabundant vacancies and diffusion enhancement in some FCC metals. In: Defect and Diffusion Forum. 2001 ; No. 194-199 PART 2. pp. 1063-1068.
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