Microstructure and hydrogen permeability in Nb–TiFe alloys

•Hydrogen permeation in Nb–TiFe alloys is investigated.•The TiFe+(Nb, Ti) eutectic structure is obtained in the Nb16Ti53Fe31 alloy in the as-cast state.•Hydrogen permeable alloys consist of the primary TiFe phase and the eutectic structure.•Hydrogen permeation performance is increased with Nb conten...

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Bibliographic Details
Published in:Journal of alloys and compounds 2013-07, Vol.566, p.68-72
Main Authors: Ishikawa, Kazuhiro, Watanabe, Shogo, Aoki, Kiyoshi
Format: Article
Language:English
Subjects:
Alloys
Condensed matter: structure, mechanical and thermal properties
Equations of state, phase equilibria, and phase transitions
Eutectic structure
Exact sciences and technology
Hydrogen embrittlement
Hydrogen permeation
Intermetallic compounds
Intermetallics
Iron compounds
Microstructure
Nb-based alloy
Niobium
Niobium base alloys
Permeability
Phases
Physics
Solubility, segregation, and mixing
phase separation
TiFe compound
Titanium
Titanium base alloys
Titanium compounds
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Summary:•Hydrogen permeation in Nb–TiFe alloys is investigated.•The TiFe+(Nb, Ti) eutectic structure is obtained in the Nb16Ti53Fe31 alloy in the as-cast state.•Hydrogen permeable alloys consist of the primary TiFe phase and the eutectic structure.•Hydrogen permeation performance is increased with Nb content. The relationship between the microstructure and hydrogen permeability of Nb–TiFe alloys is investigated. The fully eutectic alloy, which consisted of the bcc-(Nb, Ti) and B2-TiFe phases, is found in the Nb16Ti53Fe31 composition. The alloys formed between the Fe50Ti50 and Nb16Ti53Fe31 compositions, expressed as (Ti50Fe50)1−x(Nb16Ti53Fe31)x, consist of the eutectic structure, including the primary TiFe phase for x1. The volume fraction of the primary phase is decreased (0
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2013.02.174