Activation of titanium-vanadium alloy for hydrogen storage by introduction of nanograins and edge dislocations using high-pressure torsion

Kaveh Edalati, Huaiyu Shao, Hoda Emami, Hideaki Iwaoka, Etsuo Akiba, Zenji Horita

Abstract

Ti-V alloys thermodynamically absorb hydrogen at room temperature, but hydrogenation does not occur practically without a sophisticated activation process. In this study, a nanograined TiV alloy with the supersaturated bcc structure and an ultrahigh density of edge dislocations (>1016 m-2) was mechanically synthesized from Ti and V powders using the high-pressure torsion (HPT) method. The presence of large fractions of grain boundaries and dislocations, as effective pathways for hydrogen diffusion, activated TiV and it absorbed ∼4 wt.% of hydrogen at room temperature after an incubation period. The kinetic measurements suggested that the hydrogen absorption in the incubation period is controlled by the slow rate of hydrogen dissociation, while the hydrogenation rate in the latter stage is controlled by diffusion of hydrogen atoms.

Original languageEnglish
Pages (from-to)8917-8924
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume41
Issue number21
DOIs
StatePublished - 2016 Jun 8
Externally publishedYes

Fingerprint

Hydrogen
Edge dislocations
Torsional stress
Hydrogenation
Chemical activation
Temperature
Vanadium alloys
Hydrogen storage
Dislocations (crystals)
Titanium alloys
Grain boundaries
Powders
Atoms
Kinetics

Keywords

  • High-pressure torsion (HPT)
  • Hydrogen storage
  • Metal hydrides
  • Phase transformation
  • Severe plastic deformation (SPD)
  • Ultrafine-grained (UFG) materials

ASJC Scopus subject areas

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

Cite this

Activation of titanium-vanadium alloy for hydrogen storage by introduction of nanograins and edge dislocations using high-pressure torsion. / Edalati, Kaveh; Shao, Huaiyu; Emami, Hoda; Iwaoka, Hideaki; Akiba, Etsuo; Horita, Zenji.

In: International Journal of Hydrogen Energy, Vol. 41, No. 21, 08.06.2016, p. 8917-8924.

Research output: Contribution to journalArticle

Edalati, Kaveh; Shao, Huaiyu; Emami, Hoda; Iwaoka, Hideaki; Akiba, Etsuo; Horita, Zenji / Activation of titanium-vanadium alloy for hydrogen storage by introduction of nanograins and edge dislocations using high-pressure torsion.

In: International Journal of Hydrogen Energy, Vol. 41, No. 21, 08.06.2016, p. 8917-8924.

Research output: Contribution to journalArticle

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AU - Akiba,Etsuo

AU - Horita,Zenji

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AB - Ti-V alloys thermodynamically absorb hydrogen at room temperature, but hydrogenation does not occur practically without a sophisticated activation process. In this study, a nanograined TiV alloy with the supersaturated bcc structure and an ultrahigh density of edge dislocations (>1016 m-2) was mechanically synthesized from Ti and V powders using the high-pressure torsion (HPT) method. The presence of large fractions of grain boundaries and dislocations, as effective pathways for hydrogen diffusion, activated TiV and it absorbed ∼4 wt.% of hydrogen at room temperature after an incubation period. The kinetic measurements suggested that the hydrogen absorption in the incubation period is controlled by the slow rate of hydrogen dissociation, while the hydrogenation rate in the latter stage is controlled by diffusion of hydrogen atoms.

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