Abstract
In this paper, effects of magnetic heat treatment (MHT) on structure and hydrogen permeation properties of Nb49Ni25Ti26 alloy membrane have been investigated. XRD and SEM were employed to characterize its phases and microstructure. Also, hydrogen diffusion coefficients (D H) of the alloy membrane were measured in Devanathan-Stachurski (D-S) dual-cell system. The results indicate that MHT-treated alloys still maintain their two-phase structure, consisting of the primary bcc-Nb (Ni, Ti) solid solution phase and (bcc-Nb(Ni, Ti) + β2-NiTi) eutectic phase, with their DH increment after MHT at 0° and 90° respectively. The maximum value of D H is 6.3822 × 10−9 H2 m2/s for the alloy membrane treated by MHT at 0° angle (magnetic field direction is parallel to membrane surface), the increase of D H is possibly due to the grain orientation, and the formation of smaller solid solution phase region with higher specific area. Such results suggest that reasonable MHT benefits to the improvement of hydrogen permeation properties of Nb49Ni25Ti26 alloy membrane.
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Published in Russian in Elektrokhimiya, 2015, Vol. 51, No. 3, pp. 303–307.
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Zhang, Hg., Wang, Zm., Liu, F. et al. Effects of magnetic heat treatment on microstructure and hydrogen permeation properties of Nb-Ti-Ni alloy membranes. Russ J Electrochem 51, 258–262 (2015). https://doi.org/10.1134/S102319351503012X
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DOI: https://doi.org/10.1134/S102319351503012X