Abstract
Microstructure and hydrogen permeability ( Φ) of as-cast Nb–Ti–Co alloys have been investigated to find out alloys combining high hydrogen permeability and large resistance to the hydrogen embrittlement by scanning electron microscopy (SEM) and by the gas permeation technique, respectively. Hydrogen permeable alloys are obtained near the line connecting the TiCo compound and pure Nb, and about 50 mol% Nb and less. These alloys are classified into three groups, i.e. (1) the primary TiCo phase and the eutectic {TiCo + (Nb, Ti)} phase, (2) TiCo + (Nb, Ti) + the eutectic {TiCo + (Nb, Ti)} phase and (3) the primary (Nb, Ti) + the eutectic {TiCo + (Nb, Ti)} phase. The present work indicates that the eutectic phase suppresses the hydrogen embrittlement of the Nb–Ti–Co alloys. The eutectic Nb 30Ti 35Co 35 alloy exhibits large resistance to the hydrogen embrittlement and the highest Φ of 2.64 × 10 −8 mol H 2 m −1 s −1 Pa −0.5 at 673 K, which is 1.7 times higher than that of pure Pd.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
