Enhanced hydrogen embrittlement of Pd-coated niobium metal membrane detected by in situ small punch test under hydrogen permeation

Nambu, T.; Shimizu, Kazuyuki; Matsumoto, Yoshihisa; Ren, Ruizhi; Watanabe, Nobuatsu; Yukawa, Hiroshi; Morinaga, Masahiko; Yasuda, Isamu

doi:10.1016/j.jallcom.2007.02.063

Cited by 62 publications

(39 citation statements)

References 14 publications

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“…3,10) Recently, Nambu et al investigated the hydrogen embrittlement of Pd-coated Nb by the in-situ small punch (SP) test method. 6) It was found that the ductile-to-brittle transition occurs drastically at the hydrogen concentration around H=M ¼ 0:25 at the temperature 573-773 K. This critical hydrogen concentration is much low as compared to the ductile-to-cleavage boundary proposed by Gahr and Birnbaum. 9) The alloying effects on the hydrogen solubility and hydrogen embrittlement have also been studied.…”

Section: Introductionmentioning

confidence: 86%

“…1,2) For example, Pd-Ag alloys are widely used practically for the separation and purification of hydrogen gas. Recently, special attention has been directed towards V-and Nb-based alloys, [3][4][5][6] because they possess higher hydrogen permeability than currently used Pd-Ag alloys. 7,8) However, there is still a large barrier to the practical use due to their poor resistance to hydrogen embrittlement.…”

Section: Introductionmentioning

confidence: 99%

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Alloy Design of Nb-Based Hydrogen Permeable Membrane with Strong Resistance to Hydrogen Embrittlement

et al. 2008

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The alloying effects of Ru and W on the hydrogen solubility, the resistance to hydrogen embrittlement and hydrogen permeability are investigated quantitatively for Nb-based hydrogen permeable alloys. It is found that the hydrogen solubility decreases by the addition of alloying element into niobium or by increasing the temperature. As a result, the resistance to hydrogen embrittlement is improved by reducing the hydrogen concentration. On the other hand, the hydrogen flux, J, through the alloy membrane increases linearly with increasing difference of hydrogen concentration, ÁC, between both sides of the membrane. It is shown that the Nb-5 mol%X (X = Ru and W) alloys possess excellent hydrogen permeability without showing any hydrogen embrittlement when used under appropriate permeation conditions, i.e. temperature and hydrogen pressures. Also, the hydrogen diffusion coefficients during the practical hydrogen permeation at high temperature are evaluated from the linear relationship between the hydrogen flux and the hydrogen concentration difference. It is found that the hydrogen diffusion coefficient of pure Nb is much lower than the reported values measured for dilute hydrogen solid solutions. Surprisingly, the hydrogen diffusion is found to be faster in Pd-26 mol%Ag alloy with fcc crystal structure than in pure niobium with bcc structure at 773 K during the hydrogen permeation. It is also interesting that the addition of Ru or W into niobium enhances the hydrogen diffusion of the practical hydrogen permeation at high temperature.

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Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Alloy Design of Nb-Based Hydrogen Permeable Membrane with Strong Resistance to Hydrogen Embrittlement

et al. 2008

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“…The investigations of the alloying effects on the hydrogen solubility are important for hydrogen permeable metal membrane in order to improve the resistance to the hydrogen embrittlement in view of the DBTC. 13) 3.2 Correlation between the hydrogen permeability and the pressure-composition-isotherm In this section, the correlation between the hydriding property and the hydrogen permeability will be discussed …”

Section: Hydrogen Permeation Testmentioning

confidence: 99%

“…6,12) Recently, the mechanical properties of niobium (Nb) and vanadium (V) membrane in hydrogen gas atmosphere have been investigated by the in-situ small punch (SP) test method. 13,14) It is found that a ductile-to-brittle transition occurs drastically at the hydrogen concentration around 0.2³0.25 (H/M) for both Nb and V membranes. 13,14) In order to prevent a brittle fracture of the membrane with group 5 metals such as Nb and V, the hydrogen concentration in the membrane must be controlled and kept below 0.2 (H/M), the ductile-to-brittle transition hydrogen concentration (DBTC), during the operation of hydrogen permeation.…”

Section: Introductionmentioning

confidence: 99%

Alloying Effects on Hydrogen Solubility and Hydrogen Permeability for V-Based Alloy Membranes

et al. 2015

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The alloying effects of chromium, molybdenum, tungsten, iron and cobalt on the hydrogen solubility of vanadium have been investigated systematically. The addition of iron or cobalt into vanadium decreases the hydrogen solubility more significantly than chromium, molybdenum and tungsten. Thus, the addition of iron or cobalt into vanadium improves the resistance to hydrogen embrittlement of the vanadium alloy itself effectively. It is also found that, in view of the new description of hydrogen permeation based on hydrogen chemical potential, these alloying elements enhance the hydrogen flux through the vanadium alloy. This is because the PCT factor, f PCT , increases by the addition of iron or cobalt. Thus, alloying these elements into vanadium improves not only the resistance to hydrogen embrittlement, but also the hydrogen permeation ability.

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“…Group 5 metals (i.e., Nb, V and Ta) are ones of the most promising materials for hydrogen permeable membranes because of their lower cost and higher hydrogen permeability than currently used Pd-based alloys. [3][4][5][6] However, there is still a large barrier to the practical application due to their poor resistance to hydrogen embrittlement.…”

Section: Introductionmentioning

confidence: 99%

Ta-W Alloy for Hydrogen Permeable Membranes

2011

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The alloying effects of tungsten on the hydrogen solubility, the resistance to hydrogen embrittlement and the hydrogen permeability are investigated for Ta-based hydrogen permeable membranes. The hydrogen solubility is found to decrease by the addition of tungsten into tantalum or by increasing the temperature. It is also found that the mechanical properties (i.e., strength and ductility) for Ta-based alloy is better than that for Nb-based alloy in hydrogen atmosphere at high temperature. It is demonstrated that the Ta-5 mol%W alloy possesses excellent hydrogen permeability without showing any hydrogen embrittlement when used under appropriate permeation conditions. For example, the hydrogen flux for Ta-5 mol%W alloy measured at 773 K under the pressure condition of inlet/outlet = 0.15/0.01 MPa is about 5 times higher than that for Pd-27 mol%Ag alloy measured at the same testing condition.

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Enhanced hydrogen embrittlement of Pd-coated niobium metal membrane detected by in situ small punch test under hydrogen permeation

Cited by 62 publications

References 14 publications

Alloy Design of Nb-Based Hydrogen Permeable Membrane with Strong Resistance to Hydrogen Embrittlement

Alloy Design of Nb-Based Hydrogen Permeable Membrane with Strong Resistance to Hydrogen Embrittlement

Alloying Effects on Hydrogen Solubility and Hydrogen Permeability for V-Based Alloy Membranes

Ta-W Alloy for Hydrogen Permeable Membranes

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