Irreversible effects in the FeTi/H system

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The equilibrium hydrogen absorption isotherm using annealed, strain-free FeTi, exhibits only one plateau up to a composition of FeTiH/sub 1.95/. However, the desorption isotherm, determined immediately after the first hydriding step, exhibits the usual two plateaux. X-ray diffraction results of samples with compositions within the absorption plateau limits indicate the major phases present to be ..cap alpha.. and ..gamma.., although a small amount of ..beta.. phase was always detected. Apparently the absorption isotherm represents the direct conversion of ..cap alpha.. ..-->.. ..gamma.. and ..beta.. phase precipitation is almost completely suppressed. Thermodynamic quantities for this conversion are given. The results are ... continued below

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Pages: 19

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Reilly, J.J.; Johnson, J.R.; Lynch, J.F. & Reidinger, F. March 1, 1982.

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Description

The equilibrium hydrogen absorption isotherm using annealed, strain-free FeTi, exhibits only one plateau up to a composition of FeTiH/sub 1.95/. However, the desorption isotherm, determined immediately after the first hydriding step, exhibits the usual two plateaux. X-ray diffraction results of samples with compositions within the absorption plateau limits indicate the major phases present to be ..cap alpha.. and ..gamma.., although a small amount of ..beta.. phase was always detected. Apparently the absorption isotherm represents the direct conversion of ..cap alpha.. ..-->.. ..gamma.. and ..beta.. phase precipitation is almost completely suppressed. Thermodynamic quantities for this conversion are given. The results are attributed to the influence of lattice strain upon the behavior of the ..beta..1 and ..beta..2 phases. A practical consequence of the effect is the distortion of the pressure-composition isotherm in the ..beta..-..gamma.. region as a function of hydriding-dehydriding cycles. This is caused by an increase in H solubility of the ..beta.. and ..gamma.. phases and the widening of the phase composition limits as the strain increases with cycle number. However, after many hundreds of cycles there is no further significant increase in strain and the isotherm shape becomes essentially fixed and reproducible. The distortion is reversible by mild annealing.

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Pages: 19

Notes

NTIS, PC A02/MF A01.

Source

  • International symposium on the properties and applications of metal hydrides, Toba, Japan, 30 May 1982

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  • Other: DE82015242
  • Report No.: BNL-31189R
  • Report No.: CONF-820548-3
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 5265146
  • Archival Resource Key: ark:/67531/metadc1063690

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • March 1, 1982

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • April 23, 2018, 4:25 p.m.

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Reilly, J.J.; Johnson, J.R.; Lynch, J.F. & Reidinger, F. Irreversible effects in the FeTi/H system, article, March 1, 1982; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc1063690/: accessed June 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.