Mechanical property and hydrogen permeability of ultrafine-grained Pd–Ag alloy processed by high-pressure torsion

Hideaki Iwaoka, Tatsuya Ide, Makoto Arita, Zenji Horita

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A process of high-pressure torsion (HPT) was used to produce an ultrafine-grained Pd–Ag alloy, and to improve mechanical property and hydrogen permeability simultaneously. Hardness values of the HPT-processed sample were much higher than those of a cold-rolled sample which is strengthened by dislocation accumulation. Additionally, in contrast to the degradation of hydrogen permeability in the cold-rolled sample due to a high density of dislocations which act as trapping sites of hydrogen atoms, the hydrogen permeability in the HPT-processed sample was improved due to a high density of high-angle grain boundaries which act as a fast diffusion path. The ultrafine-grained structure in the Pd–Ag alloy was retained during permeation testing at 300 °C due to the addition of silver.

Original languageEnglish
Pages (from-to)24176-24182
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume42
Issue number38
DOIs
Publication statusPublished - Jan 1 2017

Fingerprint

Torsional stress
torsion
permeability
mechanical properties
Mechanical properties
Hydrogen
hydrogen
Permeation
hydrogen atoms
Grain boundaries
Silver
hardness
grain boundaries
Hardness
trapping
silver
degradation
Degradation
Atoms
Testing

All Science Journal Classification (ASJC) codes

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

Cite this

Mechanical property and hydrogen permeability of ultrafine-grained Pd–Ag alloy processed by high-pressure torsion. / Iwaoka, Hideaki; Ide, Tatsuya; Arita, Makoto; Horita, Zenji.

In: International Journal of Hydrogen Energy, Vol. 42, No. 38, 01.01.2017, p. 24176-24182.

Research output: Contribution to journalArticle

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