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Metal Hydrides pp 145-176 | Cite as

An Introduction to Hydrogen in Alloys

  • D. G. Westlake
Part of the NATO Advanced Study Institutes Series book series (NSSB, volume 76)

Abstract

Substitutional alloys, both those that form hydrides and those that do not, are discussed, but with more emphasis on the former than the latter. This overview includes the following closely related subjects: 1) the significant effects of substitutional solutes on the pressure-composition-temperature (PCT) equilibria of metal-hydrogen systems, 2) the changes in thermodynamic properties resulting from differences in atom size and from modifications of electronic structure, 3) attractive and repulsive interactions between H and solute atoms and the effects of such interactions on the pressure dependent solubility for H, 4) “H trapping” in alloys of Group V metals and its effect on the terminal solubility for H (TSH), 5) some other mechanisms invoked to explain the enhancement (due to alloying) of the (TSH) in Group V metals, and 6) “H-impurity complexes” in alloys of the metals Ni, Co, and Fe. Some results showing that an enhanced TSH may ameliorate the resistance of a metal to hydrogen embrittlement are presented. Recent studies of resistivity and of elastic constants are summarized as just two examples of the important effects that interstitial hydrogen can have on the properties of metals and their alloys. Finally, a potential hydrogen storage material, ZrNi, is considered. From empirical rules, predictions are made regarding both the particular sites that can be occupied by hydrogen in this intermetallic compound and the resultant stoichiometries.

Keywords

Hydrogen Embrittlement Solute Atom Hydride Phase Hydrogen Solubility Octahedral Interstice 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1981

Authors and Affiliations

  • D. G. Westlake
    • 1
  1. 1.Materials Science DivisionArgonne National LaboratoryArgonneUSA

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