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| Microstructures and Hydrogen Permeation Characteristics of Nb-Ti-Ni Alloys |
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| 中国科学院金属研究所 |
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Cite this article:
;. Microstructures and Hydrogen Permeation Characteristics of Nb-Ti-Ni Alloys. Acta Metall Sin, 2008, 44(7): 781-785 .
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Abstract Microstructures and hydrogen permeation properties of Nb50Ti25Ni25 and Nb40Ti30Ni30 alloy were investigated, respectively, and compared with Nb, Pd and PdAg alloy. The results indicated that the microstructures of Nb50Ti25Ni25 and Nb40Ti30Ni30 alloy consisted of combinations of the primary bcc-(Nb, Ti) solid solution with the eutectic {bcc-(Nb, Ti)+B2-TiNi}. The volume fraction of the eutectic phase increased with addition of Ni and Ti, in contrast to decrease of the primary phase. The hydrogen permeabilities of Nb50Ti25Ni25 and Nb40Ti30Ni30 alloys at 673K were 1.71×10-8 molm-1s-1Pa-0.5 and 1.03×10-8 molm-1s-1Pa-0.5, respectively, which were in same magnitude level as pure Pd metal, but a little lower than that of PdAg alloy. Increasing of eutectic phase favored resistance to hydrogen embrittlement, while the hydrogen permeability of the alloys increased evidently with the increasing of the primary phase. Alloys with high hydrogen permeability and good resistance to hydrogen embrittlement can be designed by optimization Ni and Ti content.
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Received: 05 November 2007
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