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

Hideaki Iwaoka, Zenji Horita

Research output: Contribution to journalArticle

5 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

Fingerprint

Torsional stress
Palladium
hydrides
torsion
palladium
Hydrides
Hydrogen
hydrogen
Permeation
Temperature
grain boundaries
Grain boundaries
temperature
diffraction
X ray diffraction
x rays

All Science Journal Classification (ASJC) codes

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

Cite this

Hydrogen behavior in ultrafine-grained palladium processed by high-pressure torsion. / Iwaoka, Hideaki; Horita, Zenji.

In: International Journal of Hydrogen Energy, Vol. 38, No. 34, 13.11.2013, p. 14879-14886.

Research output: Contribution to journalArticle

Iwaoka, Hideaki ; Horita, Zenji. / Hydrogen behavior in ultrafine-grained palladium processed by high-pressure torsion. In: International Journal of Hydrogen Energy. 2013 ; Vol. 38, No. 34. pp. 14879-14886.
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