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

抄録

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.

本文言語英語
ページ(範囲)8917-8924
ページ数8
ジャーナルInternational Journal of Hydrogen Energy
41
21
DOI
ジャーナル掲載日出版済み - 2016 6 8
外部発表Yes

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

Keywords

    ASJC Scopus subject areas

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

    これを引用

    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.

    :: International Journal of Hydrogen Energy, 巻 41, 番号 21, 08.06.2016, p. 8917-8924.

    研究成果: ジャーナルへの寄稿記事

    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.

    :: International Journal of Hydrogen Energy, 巻 41, 番号 21, 08.06.2016, p. 8917-8924.

    研究成果: ジャーナルへの寄稿記事

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    keywords = "High-pressure torsion (HPT), Hydrogen storage, Metal hydrides, Phase transformation, Severe plastic deformation (SPD), Ultrafine-grained (UFG) materials",
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    AU - Edalati,Kaveh

    AU - Shao,Huaiyu

    AU - Emami,Hoda

    AU - Iwaoka,Hideaki

    AU - Akiba,Etsuo

    AU - Horita,Zenji

    PY - 2016/6/8

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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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    KW - Hydrogen storage

    KW - Metal hydrides

    KW - Phase transformation

    KW - Severe plastic deformation (SPD)

    KW - Ultrafine-grained (UFG) materials

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