Micromechanical characterization of rapidly-solidified Nb-TiNi hydrogen permeation alloy membranes

Yusuke Shimada, Mitsuhiro Matsuda, Yuji Kawakami, Masaaki Otsu, Kazuki Takashima, Minoru Nishida, Kazuhiro Ishikawa, Kiyoshi Aoki

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3 Citations (Scopus)


The micromechanical tests have been performed for melt-spun Nb-TiNi ribbons, and the relation between the mechanical properties and microstructural change with heat treatment has been investigated. Micro-cantilever specimens with dimensions of 10(B) × 20(W) × 50(L) μm 3 were prepared by focused ion beam (FIB) machining. Fracture tests were carried out at room temperature in air using a mechanical testing machine developed for micro-sized specimens. The fracture toughness value (K Q) of as-melt spun ribbon which consists of an amorphous phase was 5.3 MPam 1/2. In contrast, the K Q of the melt-spun ribbon annealed at 773 K for 3.6 ks decreases to 2.8 MPam 1/2. With annealing above 973 K fracture toughness increases again. This is due to the nanocrystallization of the amorphous phase and the formation of aggregates which are composed of B2-TiNi and bcc-Nb (Ti) phase with the cube-on-cube orientation relationship. These results suggest that the high temperature annealing is required for the application to the hydrogen permeation membrane.

Original languageEnglish
Pages (from-to)1015-1020
Number of pages6
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Issue number12
Publication statusPublished - Dec 2008

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry


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