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

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

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Abstract

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.

Original languageEnglish
Pages (from-to)1784-1792
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume36
Issue number2
DOIs
Publication statusPublished - Jan 1 2011

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All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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