Hydrogen diffusion in ultrafine-grained iron with the body-centered cubic crystal structure

Hideaki Iwaoka, Makoto Arita, Zenji Horita

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)

    Abstract

    The role of grain boundaries in Fe on hydrogen diffusion has been investigated by electrochemical permeation tests using ultrafine-grained Fe produced by high-pressure torsion (HPT) processing. Permeation tests were also conducted on cold-rolled and water-quenched Fe to understand the trapping effect of dislocations and vacancies. Hydrogen diffusion was delayed in all these discs. However, the delay mechanism in the HPT-processed disc was different from that in rolled and water-quenched Fe. Grain boundaries do not act as trapping sites but slow the diffusion. The diffusion coefficients of hydrogen were significantly decreased by HPT processing on account of the high activation energy for hydrogen diffusion in grain boundaries.

    Original languageEnglish
    Pages (from-to)158-168
    Number of pages11
    JournalPhilosophical Magazine Letters
    Volume97
    Issue number4
    DOIs
    Publication statusPublished - Apr 3 2017

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics

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