Hydrogen permeation in rapidly quenched amorphous and crystallized Nb 20Ti40Ni40 alloy ribbons

Kazuhiro Ishikawa, Yuta Seki, Koichi Kita, Mitsuhiro Matsuda, Minoru Nishida, Kiyoshi Aoki

研究成果: ジャーナルへの寄稿学術誌査読

39 被引用数 (Scopus)


Formation of an amorphous (a-) Nb20Ti40Ni 40 alloy by rapid quenching and its crystallization behavior were investigated by X-ray diffraction, differential scanning calorimetry and scanning electron microscopy. The B2-TiNi phase was firstly crystallized and the remaining amorphous (a-) phase subsequently decomposed into the bcc-(Nb, Ti) + B2-TiNi phases. The crystallized (c-) Nb20Ti40Ni 40 samples obtained by annealing above 1173 K were ductile and insusceptible to hydrogen embrittlement between 598 and 673 K. Hydrogen permeability at 673 K (Φ673K) for the a- and c-Nb20Ti 40Ni40 alloys were 8.1 × 10-9 and (3.0-4.8) × 10-9 mol H2/m/s/Pa0.5, respectively. Φ673K increased with the increase in the diameter of the bcc-(Nb, Ti) phase, although this led to poor resistance to hydrogen embrittlement. The lower hydrogen permeability of the c-Nb20Ti 40Ni40 alloy was due to its lower hydrogen diffusivity. The present work demonstrated that rapid quenching and subsequent annealing are useful to prepare thermally stable Nb-TiNi hydrogen permeation alloy membranes.

ジャーナルInternational Journal of Hydrogen Energy
出版ステータス出版済み - 1月 2011

!!!All Science Journal Classification (ASJC) codes

  • 再生可能エネルギー、持続可能性、環境
  • 燃料技術
  • 凝縮系物理学
  • エネルギー工学および電力技術


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