Protium absorption properties of Ti–V–Cr–Mn alloys with a b.c.c. structure

Tamura, Takuya; Tominaga, Yoshio; Matsumoto, Kaname; Fuda, Takeshi; Kuriiwa, Takahiro; Kamegawa, Atsunori; Takamura, Hitoshi; Okada, Masuo

doi:10.1016/s0925-8388(01)01544-4

Cited by 65 publications

(34 citation statements)

References 7 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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“…Some of the identified shortcomings of these alloys include poor pressure-composition-temperature (PCT) plateau characteristics, low hydrogen desorption capacities, and long activation times [4][5][6][7]. In an attempt to improve on these shortcomings, controlled quantities of additives such as Fe, Zr, and Mn have been found to be effective in lowering cost and enhancing the overall performance of the alloy [8][9][10][11]. The effects of substituting Fe for Cr on the hydrogen storage property of the Ti 0.32 Cr 0.43 V 0.25 alloy showed that the desorption plateau pressure increased without decrease in effective hydrogen capacity, suggesting the possibility of using ferrovanadium as a substitute for the expensive pure vanadium [12].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Storage Characteristics and Corrosion Behavior of Ti24V40Cr34Fe2 Alloy

et al. 2017

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Abstract:In this work, we investigated the effects of heat treatment on the microstructure, hydrogen storage characteristics and corrosion rate of a Ti 34 V 40 Cr 24 Fe 2 alloy. The arc melted alloy was divided into three samples, two of which were separately quartz-sealed under vacuum and heated to 1000 • C for 1 h; one of these samples was quenched and the other furnace-cooled to ambient temperature. The crystal structures of the samples were studied via X-ray diffractometry and scanning electron microscopy. Hydrogenation/dehydrogenation characteristics were investigated using a Sievert apparatus. Potentiostat corrosion tests on the alloys were performed using an AutoLab ® corrosion test apparatus and electrochemical cell. All samples exhibited a major body-center-cubic (BCC) and some secondary phases. An abundance of Laves phases that were found in the as-cast sample reduced with annealing and disappeared in the quenched sample. Beside suppressing Laves phase, annealing also introduced a Ti-rich phase. The corrosion rate, maximum absorption, and useful capacities increased after both heat treatments. The annealed sample had the highest absorption and reversible capacity. The plateau pressure of the as-cast alloy increased after quenching. The corrosion rate increased from 0.0004 mm/y in the as-cast sample to 0.0009 mm/y after annealing and 0.0017 mm/y after quenching.

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Protium absorption properties of Ti–V–Cr–Mn alloys with a b.c.c. structure

Cited by 65 publications

References 7 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

Hydrogen Storage Characteristics and Corrosion Behavior of Ti24V40Cr34Fe2 Alloy

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