Abstract
The microstructure of Nb30Ti35Co30Fe5 eutectic alloy was investigated by using scanning electron microscope (SEM) and transmission electron microscope (TEM). The alloy exhibits typically lamellar eutectic structures which are composed of uniformly arranged nano-scale bcc-(Nb) phases and B2–Ti(Co, Fe) phases. 5 at% Fe partially substituting Co induced the composition modification of bcc-(Nb) phase such as the increasing Ti/Nb ratio and existing Fe solutes, which contributes to the enhanced hydrogen permeability. Nb30Ti35Co30Fe5 eutectic alloy shows strong sustainability during hydrogen permeation under continuous hydrogen pressure and thermal cycles, and the hydrogen permeation flux can restore when the hydrogen pressure or temperature recovered again. No hydrogen induced fractures were found during hydrogen permeation. The present work demonstrates that Nb30Ti35Co30Fe5 eutectic alloy exhibits excellent sustainability under the conditions of changing temperature and feed hydrogen pressure, which is very promising to be an alternative for Pd used for hydrogen separation and purification.
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