The Effect of Additional Elements on Hydrogen Permeation properties of Melt-Spun Ni-Nb-Zr Amorphous Alloys

Shin Ichi Yamaura, Yoichiro Shimpo, Hitoshi Okouchi, Motonori Nishida, Osamu Kajita, Akihisa Inoue

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    39 Citations (Scopus)

    Abstract

    The (Ni0.6Nb0.4)45Zr50X 5 (X = Al, Co, Cu, P, Pd, Si, Sn, Ta or Ti) alloy ribbons were produced by the melt-spinning technique. All ribbon specimens were confirmed to have a single amorphous phase by XRD analysis. The crystallization temperatures of the melt-spun (Ni0.6Nb0.4)45Zr 50X5 (X = Al, P, Pd, Si or Sn) amorphous alloys are higher than that of the (Ni0.6Nb0.4)45Zr50 amorphous alloy (727 K). Although the hydrogen permeability of the (Ni 0.6Nb0.4)45Zr50X5 (X = Si, Sn, Ta or Ti) amorphous alloys could not be measured due to severe embrittlement during the permeation test, the (Ni0.6Nb 0.4)45Zr50X5 (X = Al, Co, Cu, P or Pd) amorphous alloys had high ductility which was enough to measure the permeability. The hydrogen permeabilities of the (Ni0.6Nb 0.4)45Zr50Co5 and the (Ni 0.6Nb0.4)45Zr50Cu5 amorphous alloys were 2.46 × 10-8 and 2.34 × 10 -8 [mol·m-1 ·s-1 ·Pa -1/2] at 673 K, respectively. The (Ni0.6Nb 0.4)45Zr50P5 amorphous alloy possesses the lowest permeability of 1.36 × 10-8 [mol·m-1·s-1·Pa-1/2] at 673 K among the alloys where the permeability was measured. The reduction of the permeability in the (Ni0.6Nb0.4)45Zr 50P5 amorphous alloy is thought to be due to a preferential development of Zr-P atomic pairs which may suppress hydrogen solubility and hydrogen diffusivity in the alloy, because the heat of mixing for Zr-P atomic pairs is negatively larger than those of other pairs such as Ni-P and Nb-P. It is concluded that the Ni-Nb-Zr-X (X=Co or Cu) amorphous alloys have high potential to hydrogen permeable membranes.

    Original languageEnglish
    Pages (from-to)330-333
    Number of pages4
    JournalMaterials Transactions
    Volume45
    Issue number2
    DOIs
    Publication statusPublished - 2004 Feb

    Keywords

    • Amorphous
    • Hydrogen permeation
    • Melt-spinning
    • Membrane
    • Separation

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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