Abstract
In order to develop high hydrogen permeability alloys, structural changes induced by hydrogenation, microstructures and hydrogen permeability Φ were investigated for samples on the straight line connecting the eutectic and the primary phase in the Nb-Ti-Ni phase diagram. Φ was measurable in the alloys containing much amount of the eutectic phase, indicating that the eutectic microstructure suppresses the hydrogen embrittlement. The value of Φ increased with increasing Nb content and the volume fraction of the primary (Nb,Ti) phase. The most Nb-rich Nh 6 8 Ti 1 7 Ni 1 5 alloy showed the highest Φ of 4.91 x 10 - 8 (mol H 2 m - 1 s - 1 Pa - 0 . 5 ) at 673 K, which is 2.5 times higher than that of the Nh 3 9 Ti 3 Ni 3 0 alloy, which has been reported to be highest in the Nb-Ti-Ni alloys. The present work demonstrated that the hydrogen permeable alloys are extended on the straight line connecting the eutectic and the primary phase to the Nb-rich side in the Nb-Ti-Ni system.
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