New Vanadium-based Protium Absorbing Alloys with Laves Phases Along Grain Boundary

Tamura, Takuya; Kuriiwa, Takahiro; Amemiya, Tamio; Fuda, Takeshi; Kamegawa, Atsunori; Takamura, Hitoshi; Okada, Masuo

doi:10.2320/matertrans1989.40.431

Cited by 17 publications

(10 citation statements)

References 4 publications

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“…Ti-Cr-V alloys with a BCC structure are regarded as one of the candidates for hydrogen storage tanks. [1][2][3][4][5][6][7][8][9][10][11][12][13] The Ti-Cr-V alloys absorb H/M = 2 (about 3.7 mass% of protium), but form stable protides (hydrides) in low hydrogen pressure regions. The protide is defined as a compound of protium, namely, a hydride hereafter.…”

Section: Introductionmentioning

confidence: 99%

Effects of Protide Structures on Hysteresis in Ti-Cr-V Protium Absorption Alloys

et al. 2002

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Ti-Cr-V alloys have a higher protium (hydrogen atom) desorption capacity, but a larger hysteresis in the absorption and desorption processes than AB 2 and AB 5 type protium absorption alloys. It is desirable that the alloys have a smaller hysteresis for the use of hydrogen storage tanks. This paper aims to clarify the effects of protide (hydride) structures on the hysteresis in Ti-Cr-V protium absorption alloys. It was found that the β phases observed after desorbing at the desorption plateau region had the BCC structure for the alloys (Ti:Cr = 2:3) containing less than 70 at%V, but the BCT structure for the alloys (Ti:Cr = 2:3) containing more than 70 at%V. A major reason for the large hysteresis in the Ti-Cr-V alloys appears to be the a-axial contraction in the absorbing process and the a-axial expansion in the desorbing process as opposed to the c-axial changes.

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Section: Introductionmentioning

confidence: 99%

Effects of Protide Structures on Hysteresis in Ti-Cr-V Protium Absorption Alloys

et al. 2002

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“…Ti-Cr-V alloys with a BCC structure, which are known to have about 3 mass% effective protium capacity with desorbing at 373 K, are regarded as one of the candidates for the media of hydrogen storage tanks. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] In view of practical use of the alloys, it is important to know absorption-desorption cyclic properties and heat balance associated with protium absorption-desorption process.…”

Section: Introductionmentioning

confidence: 99%

Effect of Absorption-Desorption Cycles on Structure and Stability of Protides in Ti-Cr-V Alloys

et al. 2002

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Ti-Cr-V alloys with a BCC structure have high protium capacities, but it is known that the cyclic properties for the alloys change with varying V content. In this paper, the cyclic properties of the Ti-Cr-V alloys are investigated in view of the crystal structure of the β protide phase, which was measured at the point after desorbing at the plateau region and the thermal stability of the γ protide phase, which was measured at the point immediately before desorbing at the desorption region. It was found that the crystal structure of the β phase was changed from BCC phase to BCT phase and the c/a increased with increasing the cycle number. This difference of the crystal structure of the β phase suggests that the lattice can't gradually contract to a-axis direction at absorbing process with increasing the cycle number. Furthermore, it was found that the absorption-desorption cycle process causes the declined slope of the ∆H plots due to existence of the different γ protides of different thermal stabilities. Namely, this result suggests that site energies of protium in the lattice have a distribution after absorption-desorption cycles.

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“…They 8,9) also reported that a Ti-40 at%V-35 at%Cr alloy with a BCC structure could absorb about 2.4 mass% protium. Recently Kuriiwa et al [10][11][12][13] reported that Ti-Cr-V protium storage alloys with low V content had excellent protium absorption-desorption properties of nearly 3 mass%. Since V metal is expensive, the Ti-Cr alloys without V would be next candidate for good protium storage capacity if they consist of a BCC phase.…”

Section: Introductionmentioning

confidence: 99%

Effects of Al Addition on Structures and Protium Absorption-Desorption Properties of Ti-Cr Alloys

et al. 2002

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The effects of Al addition on structures and protium absorption-desorption properties of Ti-Cr alloys were investigated. It was found that 1 at% Al addition is effective for improvement of protium storage capacity. The BCC phase increases with increasing Al content in TiCr-Al alloys. It is generally well known that plateau pressure of the protium storage alloys, e.g. Ti-Cr-V and Ti-Fe-V alloys, increases with decreasing lattice constants, however, the plateau pressure of the Ti-Cr-Al alloys increases with increasing lattice constants, namely increasing Al content.

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New Vanadium-based Protium Absorbing Alloys with Laves Phases Along Grain Boundary

Cited by 17 publications

References 4 publications

Effects of Protide Structures on Hysteresis in Ti-Cr-V Protium Absorption Alloys

Effects of Protide Structures on Hysteresis in Ti-Cr-V Protium Absorption Alloys

Effect of Absorption-Desorption Cycles on Structure and Stability of Protides in Ti-Cr-V Alloys

Effects of Al Addition on Structures and Protium Absorption-Desorption Properties of Ti-Cr Alloys

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