Hydrogen permeation in anisotropic Nb–TiNi two-phase alloys formed by forging and rolling

Ishikawa, Kazuhiro; Tokui, Sho; Aoki, Kiyoshi

doi:10.1016/j.ijhydene.2017.03.127

Cited by 16 publications

(5 citation statements)

References 36 publications

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“…Shortly afterwards, Nb 5 Ti 60 Fe 35 , with the highest permeability in this system, was developed by the present authors [12]. As is well known, V and Nb, both belonging to the 5B group, have similar chemical and physical properties as well as electronic structures [6][7][8][9]13,14]. Moreover, V has the ability to maintain bcc structure over a wider composition range than Ta or Nb [15].…”

Section: Introductionmentioning

confidence: 60%

“…The two possible causes responsible for this phenomenon are microstructure changes and an increase in Ti content in bcc-(V, Ti) solid solution. On the one hand, compared to the compound TiFe phase, the solid solution bcc-(V, Ti) phase is more prone to hydrogen absorption [4][5][6][7][8][9]40]. In this case, alloys #4-#6, with more primary bcc-(V, Ti) phase, have relatively high hydrogen solubility and are more prone to hydrogen em-brittlement compared to alloys #1 and #2 with more primary TiFe phase.…”

Section: Resultsmentioning

confidence: 99%

“…Although good results have been achieved in the early stage, the selection of higher performance alloy components is relatively difficult due to the lack of phase diagrams in relevant ternary or quaternary alloys. For example, in the early research of Nb-Ti-Ni [8] or Ta-Ti-Ni [61] systems, Ishikawa et al [61] needed to try various components to obtain satisfactory alloys with maximum hydrogen permeability. In addition, for membranes prepared using special preparation techniques, multiple work procedures are required to achieve the desired thickness.…”

Section: No Samples Hydrogen Permeability Hydrogen Solubility Hydroge...mentioning

confidence: 99%

“…Recently, group 5B metals (Nb, V, Ta) and homologous alloys have been considered potential candidates to replace the benchmark Pd-based hydrogen permeation membrane [1][2][3]. In particular, V-or Nb-based multi-phase alloys (e.g., Nb-TiCo [4,5], Nb-TiNi [6][7][8], V-TiNi [9], V-Al [10]) have been widely studied due to their low-price advantage, favourable hydride phase stability, and excellent mechanical properties. To increase the catalytic activity to H 2 , a dense Pd layer of ~200 nm is usually deposited on the alloy surface, and the schematic diagram of these composite membranes is shown in Figure 1a,b.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Phase Equilibria of the V-Ti-Fe System and Its Applications in the Design of Novel Hydrogen Permeable Alloys

Wang,

Jia,

Yan

et al. 2023

Membranes

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The precise liquidus projection of the V-Ti-Fe system are crucial for designing high-performance hydrogen permeation alloys, but there are still many controversies in the research of this system. To this end, this article first uses the CALPHAD (CALculation of PHAse Diagrams) method to reconstruct the alloy phase diagram and compares and analyses existing experimental data, confirming that the newly constructed phase diagram in this article has good reliability and accuracy. Second, this obtained phase diagram was applied to the subsequent development process of hydrogen permeation alloys, and the (Ti65Fe35)100−xVx (x = 0, 2.5, 5, 10, 15, 25) alloys with dual-phase {bcc-(V, Ti) + TiFe} structure were successfully explored. In particular, the alloys with x values equal to 2.5 at.% and 5 at.% exhibit relatively high hydrogen permeability. Third, to further increase the H2 flux permeation through the alloys, a 500-mm-long tubular (Ti65Fe35)95V5 membrane for hydrogen permeation was prepared for the first time. Hydrogen permeation testing showed that this membrane had a very high H2 flux (4.06 mL min−1), which is ca. 6.7 times greater than the plate-like counterpart (0.61 mL min−1) under the same test conditions. This work not only indicates the reliability of the obtained V-Ti-Fe phase diagram in developing new hydrogen permeation alloys, but also demonstrates that preparing tubular membranes is one of the most important means of improving H2 flux.

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Section: Introductionmentioning

confidence: 60%

Section: Resultsmentioning

confidence: 99%

Section: No Samples Hydrogen Permeability Hydrogen Solubility Hydroge...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Phase Equilibria of the V-Ti-Fe System and Its Applications in the Design of Novel Hydrogen Permeable Alloys

Wang,

Jia,

Yan

et al. 2023

Membranes

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“…Doped alloy elements are an effective means of minimising the impact of embrittlement and helping to extend the membrane lifetimes. Common elements mainly involve Ti, Ni, Co, Hf, W, Mo, Cu, or a combination of them [ 39 , 45 , 46 , 47 ]. In this case, the key is to understand the phase diagram information of the multi-element alloy formed after doping elements and design reasonable components to avoid the generation of hydrogen-absorbing phases and hydride phase transition.…”

Section: Discussionmentioning

confidence: 99%

Phase Equilibria, Solidified Microstructure, and Hydrogen Transport Behaviour in the V-Ti-Co System

Yan,

Guo,

Jia

et al. 2023

Membranes

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At present, the V-Ti-Co phase diagram is not established, which seriously hinders the subsequent development of this potential hydrogen permeation alloy system. To this end, this article constructed the first phase diagram of the V-Ti-Co system by using the CALculation of PHAse Diagrams (CALPHAD) approach as well as relevant validation experiments. On this basis, hydrogen-permeable VxTi50Co50−x (x = 17.5, 20.5, …, 32.5) alloys were designed, and their microstructure characteristics and hydrogen transport behaviour were further studied by XRD, SEM, EDS, and so on. It was found that six ternary invariant reactions are located in the liquidus projection, and the phase diagram is divided into eight phase regions by their connecting lines. Among them, some alloys in the TiCo phase region were proven to be promising candidate materials for hydrogen permeation. Typically, VxTi50Co50−x (x = 17.5–23.5) alloys, which consist of the primary TiCo and the eutectic {bcc-(V, Ti) and TiCo} structure, show a high hydrogen permeability without hydrogen embrittlement. In particular, V23.5Ti50Co26.5 exhibit the highest permeability of 4.05 × 10−8 mol H2 m−1s−1Pa−0.5, which is the highest value known heretofore in the V-Ti-Co system. The high permeability of these alloys is due in large part to the simultaneous increment of hydrogen solubility and diffusivity, and is closely related to the composition of hydrogen permeable alloys, especially the Ti content in the (V, Ti) phase. The permeability of this alloy system is much higher than those of Nb-TiCo and/or Nb-TiNi alloys.

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Effect of Pd overlayer and mixed gases on hydrogen permeation of Pd/Nb30Hf35Co35/Pd composite membranes

Yan

Min

Misra

et al. 2018

International Journal of Hydrogen Energy

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Hydrogen permeation in anisotropic Nb–TiNi two-phase alloys formed by forging and rolling

Cited by 16 publications

References 36 publications

Phase Equilibria of the V-Ti-Fe System and Its Applications in the Design of Novel Hydrogen Permeable Alloys

Phase Equilibria of the V-Ti-Fe System and Its Applications in the Design of Novel Hydrogen Permeable Alloys

Phase Equilibria, Solidified Microstructure, and Hydrogen Transport Behaviour in the V-Ti-Co System

Effect of Pd overlayer and mixed gases on hydrogen permeation of Pd/Nb30Hf35Co35/Pd composite membranes

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