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Hydrogen permeability (Φ) of eutectic Nb-Zr-Ni alloy membranes containing the primary phases ZrNi or bcc-(Nb, Zr) was measured using a gas flow meter. Φ of the Nb 1 0 Zr 4 5 Ni 4 5 alloy containing the primary ZrNi phase (16 vol%) was 2.35 x 10 - 8 [mol H 2 m - 1 s - 1 Pa - 0 . 5 ] at 673 K, while Φ of the Nb 2 0 Zr 4 0 Ni 4 0 alloy containing the primary bcc-(Nb, Zr) phase (18 vol%) was 2.73 × 10 - 8 [mol H 2 m - 1 s - 1 Pa - 0 . 5 ] at 673 K. These values were higher than that of pure Pd and of the Nb 3 9 Ti 3 1 Ni 3 0 alloy that shows the highest Φ value in the Nb-Ti-Ni system. The present work strongly supported our previous proposal that multiphase alloys containing eutectic structures, which suppress a hydrogen embrittlement, are promising as novel hydrogen permeation membranes.

Hydrogen Permeation of Eutectic Nb-Zr-Ni Alloy Membranes Containing Primary Phases