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Published online by Cambridge University Press: 01 February 2011
Microstructure, crystal structure and hydrogen permeability (Φ) of Nb-Ti-Ni alloys on the straight line connecting the compositions of the eutectic and the primary (Nb, Ti) phase have been investigated to develop the alloys showing high hydrogen permeability with a scanning electron microscope (SEM), an X-ray diffractometer (XRD), and a gas permeation apparatus, respectively. These alloys consist of the B2-TiNi compound and the bcc- (Nb, Ti) solid solution and are hydrogen permeable when they contain much amount of the eutectic phase. The values of Φ for these alloys increase with increasing temperature and Nb content. The Nb68Ti17Ni15 alloy shows the highest Φ of [molH2m−1s−1Pa−0.5] at 673 K, which is 3.1 times higher than that of pure Pd. The present work demonstrates that the alloys showing the high Φ values are obtained on the straight line connecting the compositions of the eutectic and the primary phase.