TY - JOUR
T1 - Micromechanical characterization of rapidly-solidified Nb-TiNi hydrogen permeation alloy membranes
AU - Shimada, Yusuke
AU - Matsuda, Mitsuhiro
AU - Kawakami, Yuji
AU - Otsu, Masaaki
AU - Takashima, Kazuki
AU - Nishida, Minoru
AU - Ishikawa, Kazuhiro
AU - Aoki, Kiyoshi
PY - 2008/12/1
Y1 - 2008/12/1
N2 - 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.
AB - 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.
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U2 - 10.2320/jinstmet.72.1015
DO - 10.2320/jinstmet.72.1015
M3 - Article
AN - SCOPUS:58649114258
VL - 72
SP - 1015
EP - 1020
JO - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
JF - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
SN - 0021-4876
IS - 12
ER -