Protium Absorption-Desorption Properties of Ti&amp;ndash;V&amp;ndash;Cr Alloys with a BCC Structure

Tominaga, Yoshio; Nishimura, Sinya; Amemiya, Tamio; Fuda, Takeshi; Tamura, Takuya; Kuriiwa, Takahiro; Kamegawa, Atsunori; Okada, Masuo

doi:10.2320/matertrans1989.40.871

Cited by 63 publications

(38 citation statements)

References 6 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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“…In general, increasing the lattice constant decrease the plateau pressure. This typical phenomenon was reported in Ti-Cr-V 13) and Ti-Fe-V 14) alloys. In this study, similar phenomenon was observed for Ti-Cr binary alloys as shown in Fig.…”

Section: 5mentioning

confidence: 84%

“…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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“…Ti-Cr-V alloys with a BCC structure are regarded as one of the candidates for hydrogen storage tanks. 1) Since the Ti-Cr-V alloys show the capacity of nearly 3 mass% at 373 K, a lot of works, such as the additions of other elements, 2-7) the effects of heat-treatment and composition, [8][9][10][11][12] V free Ti-Cr alloys, [13][14][15][16] cyclic properties [17][18][19] and the effects on hysteresis, 20) have been reported in improving the properties. Ti-Cr-V alloys absorb protium up to H/M = 2 (about 3.7 mass% of protium), but desorb about 2.4 mass% from the viewpoint of protium desorption capacity (9-0.01 MPa) through forming stable protides in low hydrogen pressure regions.…”

Section: Introductionmentioning

confidence: 99%

Isotope Effects on Protium and Deuterium Absorption Properties in Ti-56 at%Cr-20 at%V Alloy

et al. 2004

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Ti-Cr-V alloys are known to absorb protium (hydrogen atom) up to H/M = 2. However, the Cr-rich alloys, e.g. Ti-Cr-20 at%V alloys containing more than 56 at%Cr, absorb up to H/M = 1 because of the formation of the mono-protides (mono-hydrides). The appearance region of the mono-dueteride was found to be more Cr-rich compositions than that of the mono-protides. For example, Ti-Cr-20 at%V alloys containing more than 60 at%Cr absorb deuterium up to D/M = 1. Therefore, Ti-56 at%Cr-20 at%V alloy absorbs protium up to H/M = 1, but deuterium up to D/M = 2. As higher protium desorption capacity is achieved by increasing the Cr content in the region of the di-protide, there is some possibility of increasing the protium desorption capacity in Ti-Cr-V alloys using the isotope effects on absorption-desorption properties of the Ti-56 at%Cr-20 at%V alloy. This paper aims to clarify the isotope effects on protium and deuterium absorption properties in the Ti-56 at%Cr-20 at%V alloy. It was found that the memory effect for the absorption plateau pressure appears only once when deuterium was absorbed after desorbing protium, and the memory effect for the absorption capacity appears when protium was absorbed after desorbing deuterium. The protium desorption capacity after deuterium treatment, namely, after desorbing deuterium showed twice as high as that without deuterium treatment in the Ti-56 at%Cr-20 at%V alloy. Increasing protium desorption capacity for deuterium treatment was caused by increasing di-protide formation and decreasing mono-protide formation.

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Protium Absorption-Desorption Properties of Ti–V–Cr Alloys with a BCC Structure

Cited by 63 publications

References 6 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

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

Isotope Effects on Protium and Deuterium Absorption Properties in Ti-56 at%Cr-20 at%V Alloy

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