Hydrogen behavior in ultrafine-grained palladium processed by high-pressure torsion

Hideaki Iwaoka, Zenji Horita

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Hydrogen permeation tests were carried out on ultrafine-grained palladium processed by high-pressure torsion (HPT) and the results were compared with those on an annealed coarse-grained state. It is shown that hydrogen diffusion is similar above 200 C but is enhanced at temperatures below 200 C in the ultrafine-grained state. All samples were subjected to X-ray diffraction analyses after the hydrogen permeation tests. It is shown that hydride formation occurs at lower temperatures in both coarse- and ultrafine-grained states but the hydride formation temperature is reduced to a lower temperature in the ultrafine-grained state. This study suggests that grain boundaries of palladium act as diffusion pass but not as the sites for hydride formation.

Original languageEnglish
Pages (from-to)14879-14886
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume38
Issue number34
DOIs
Publication statusPublished - Nov 13 2013

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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