Ti–V–Cr b.c.c. alloys with high protium content

Okada, Masuo; Kuriiwa, Takahiro; Tamura, Takuya; Takamura, Hitoshi; Kamegawa, Atsunori

doi:10.1016/s0925-8388(01)01647-4

Cited by 154 publications

(97 citation statements)

References 6 publications

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“…Fig. 6 The hydrogen pressure-composition-isotherms of the TiCr 2−x (x = 0, 0.2 and 0.5) samples prepared by MG at 313 K, together with the data reported by Okada et al 17) condition of the activation treatment in this study; 573 K for the reaction temperature and 5 MPa for the hydrogen pressure. After the activation treatments, the PC-isotherms were measured at 313 K. Figure 6 shows the PC-isotherms in the absorption-desorption process of the TiCr 2−x (x = 0, 0.2 and 0.5) samples prepared by MG, together with the data of Ti-V-Cr with bcc structure prepared by melting and heat treatment.…”

Section: Resultssupporting

confidence: 65%

Hydrogenation of Body-Centered-Cubic Titanium-Chromium Alloys Prepared by Mechanical Grinding

et al. 2002

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The C15 and C14 intermetallic TiCr 2−x (x = 0, 0.2 and 0.5) compounds were subjected to grinding in a high-energy ball mill. The X-ray diffraction profiles showed that the crystal structure transformed from C15 and C14 to bcc after mechanical grinding for 57.6 ks. The hydrogenation properties of the TiCr 2−x (x = 0, 0.2 and 0.5) samples were examined by differential thermal analysis and pressure-composition isotherm measurements. The sample reacted with hydrogen at 5 MPa and 523 K by maintaining the bcc structure. An higher hydrogen content was observed for the sample with the higher Ti content. The maximum hydrogen content of TiCr 2.0 , TiCr 1.8 and TiCr 1.5 was found to be about 0.32, 0.36 and 0.47 H/M at 313 K, respectively, at 8 MPa.

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Section: Resultssupporting

confidence: 65%

Hydrogenation of Body-Centered-Cubic Titanium-Chromium Alloys Prepared by Mechanical Grinding

et al. 2002

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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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“…After the incubation time, the absorption proceeds quite rapidly and full capacity is reached in less than 300 s for both pure vanadium and vanadium substituted alloys. The maximum capacity is close to 3.2 wt % of hydrogen, which is slightly higher than other Ti-V based materials that was reported in the literature [24][25][26][27]. Rietveld refinements were performed on the three patterns and results are shown in Table 2.…”

Section: Crystal Structurementioning

confidence: 79%

Replacement of Vanadium by Ferrovanadium in a Ti-Based Body Centred Cubic (BCC) Alloy: Towards a Low-Cost Hydrogen Storage Material

2018

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Featured Application: Cost reduction of metal hydrides for hydrogen storage. Abstract:We report here the effect on hydrogen sorption behavior of replacing vanadium by ferrovanadium (FeV) in Ti-V-Cr Body Centred Cubic (BCC) solid solution alloys. The compositions studied were Ti 1.56 V 0.36 Cr 1.08 and Ti 1.26 V 0.63 Cr 1.11 . Both of the alloys were synthesized by melting with 4 wt % of Zr 7 Ni 10 in order to enhance the first hydrogenation (i.e., activation) kinetics. The ferrovanadium substitution leads to the same microstructure as the vanadium pristine alloys and no significant change in the lattice parameters was found. However, a longer incubation time was observed in the activation process for the FeV substituted alloy. Finally, the replacement of vanadium by ferrovanadium did not have a noticeable impact on the hydrogen capacities, heat of formation, and entropy.

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Ti–V–Cr b.c.c. alloys with high protium content

Cited by 154 publications

References 6 publications

Hydrogenation of Body-Centered-Cubic Titanium-Chromium Alloys Prepared by Mechanical Grinding

Hydrogenation of Body-Centered-Cubic Titanium-Chromium Alloys Prepared by Mechanical Grinding

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

Replacement of Vanadium by Ferrovanadium in a Ti-Based Body Centred Cubic (BCC) Alloy: Towards a Low-Cost Hydrogen Storage Material

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