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AbstractAbstract
[en] Differences between the data of the author (Trans. TMS-AIME 245: 287(1969)) and that of Whitton et al. (Scripta Met. 9: 851 (1975)), which was obtained using the channeling of 1-MeV He ions, are discussed
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Published in Summary Form Only.
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Journal Article
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Scripta Metallurgica; v. 10(1); p. 75
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AbstractAbstract
[en] Published in summary form only
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Lewis, F.A.; Wicke, E. (eds.); 946 p; ISBN 3-486-68270-9;
; 1986; p. 491-492; Oldenbourg; Muenchen (Germany, F.R.); International symposium on hydrogen in metals; Belfast (UK); 26-29 Mar 1985; Reprinted from Z. Phys. Chem., Neue Folge (1985) v. 145 p. 237-238

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Book
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Pick, M.A.; Hanson, A.; Jones, K.W.; Goland, A.N.
Brookhaven National Lab., Upton, NY (USA)1982
Brookhaven National Lab., Upton, NY (USA)1982
AbstractAbstract
[en] Samples hydrided in two different ways were investigated. The materials used were thin foils (50 μm, MARZ grade) of niobium, 10 x 25 mm in size. The two methods of hydriding produced different surface conditions which were the subject of the present investigation. One method consisted of the following procedures. The samples were outgassed and cleaned in UHV to remove virtually all the interstitial impurities from the bulk and surface. A small spot of Pd was then deposited onto the clean surface of the niobium in situ in the UHV-system by evaporation from a hot Pd filament. The second method of hydriding was similar to that used by most investigators of metal-hydrogen systems. A sample is placed in the hydriding unit and allowed to absorb a premeasured amount of hydrogen while cooling from approx. 800 C where the surface oxide is dissolved into the bulk. In order to study the effect of a poor vacuum in the hydriding unit, samples were heated to 800 C in different base pressures prior to the admission of hydrogen. One sample was heated in 1 x 10-5 Torr oxygen
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1982; 7 p; International symposium on the electronic structure and properties of hydrogen in metals; Richmond, VA (USA); 4 - 6 Mar 1982; CONF-820325--7; Available from NTIS., PC A02/MF A01 as DE82009880
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Report
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AbstractAbstract
No abstract available
Original Title
Die Wasserstoffbindung in HNb6I11 - ein Modell fuer Interstitialhydride
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Annual conference of lecturers for chemistry of the Chemical Society of the GDR; Potsdam (German Democratic Republic); 12 - 14 May 1982; Published in summary form only.
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Journal Article
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Conference
Journal
Zeitschrift fuer Chemie; ISSN 0044-2402;
; v. 22(9); p. 354

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AbstractAbstract
[en] The hidrogen embrittlement of exothermic ocluders, had been considered as due to applied stress induced hydride precipitates leading to brittle fracture. The results of simultaneous measurements of macroscopic deformation and elastic change due to hydride precipitation, using the ultrasonic pulse-echo technique are showed. THen it was tested the possibility of kinectis precipitation parameters evoluation. (Author)
[pt]
A fragilizacao de metais oclusores exotermicos dopados com hidrogenio tem sido considerada como sendo devido a precipitacao de hidreto induzida pela propria tensao que leva a fratura. Mostram-se os resultados da medida simultanea de deformacao macroscopica e da variacao da constante elastica do metal provocada pela precipitacao de hidreto, utilizando-se a tecnica do pulso eco ultra-sonico. Foram realizados ensaios que possibilitaram a avaliacao dos parametros da cinetica de precipitacao. (Autor)Original Title
Observacao ultra-sonica da precipitacao de hidreto em niobio
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Source
1982; 11 p; 5. Brazilian Congress on Materials Science and Engineering; Porto Alegre, RS (Brazil); 13-15 Dec 1982
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Miscellaneous
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Conference
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AbstractAbstract
[en] The free energy loss has been theoretically evaluated in the model Nb-H system at 313 K for the solid solution → monohydride and monohydride → dihydride transformations. The origin for this hysteresis loss has been explained by considering the elasto-plastic accommodation processes that occur in the Nb-H system during these hydrogen transformations. The calculated free energy loss for the solid solution → monohydride transformation shows excellent agreement with experimental results. Possible sources of error in the calculations have been elucidated. The present elasto-plastic approach is compared with previous theories of hysteresis. It is found that the elasto-plastic accommodation theory offers the best explanation for the hysteresis phenomenon observed in metal-hydrogen systems
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AbstractAbstract
[en] The Compton profiles of Nb and NbHsub(0.76) single crystals have been measured along [100] and [110] using 412 keV gamma-radiation from a 198Au source. The changes in the band electron profile of the metal following the introduction of hydrogen are interpreted in terms of the protonic model of the hydride. Qualitative changes in the directional profiles can be understood within the rigid band approximation. (orig.)
[de]
Unter Verwendung der 412 KeV-Gammastrahlung einer 198Au-Quelle wurden die Comptonprofile von Nb- und NbHsub(0,76)-Einkristallen entlang der [100] und [110] Achse gemessen. Die Aenderungen des Elektronenbandprofils im Metall nach Einbringen von Wasserstoff werden im Rahmen des protonischen Modells des Hydrids interpretiert. Qualitative Aenderungen der Richtungsprofile koennen mit Hilfe der Naeherung starrer Baender verstanden werden. (orig.)Source
2 figs.; 19 refs.
Record Type
Journal Article
Journal
Z. Phys., B; v. 27(3); p. 205-208
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AbstractAbstract
No abstract available
Original Title
Das experimentelle Compton-Profil von Deuterium in NbDsub(0.6)
Source
Spring meeting of the Arbeitskreis Festkoerperphysik at the Deutsche Physikalische Gesellschaft e.V. in conjunction with the Nederlandse Natuurkundige Vereninging and 2. symposium on solid state device technology; Muenster, Germany, F.R; 7 - 12 Mar 1977; AED-CONF--77-079-021; Short communication only.
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Journal Article
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Verhandlungen der Deutschen Physikalischen Gesellschaft; (no. 1); p. 122
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BASIC INTERACTIONS, CRYSTALS, ELASTIC SCATTERING, ELECTROMAGNETIC INTERACTIONS, ELEMENTS, HYDRIDES, HYDROGEN COMPOUNDS, HYDROGEN ISOTOPES, INTERACTIONS, ISOTOPES, LIGHT NUCLEI, METALS, NIOBIUM COMPOUNDS, NUCLEI, ODD-ODD NUCLEI, SCATTERING, STABLE ISOTOPES, TRANSITION ELEMENT COMPOUNDS, TRANSITION ELEMENTS
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AbstractAbstract
[en] The application of ion microprobe mass spectrometry to various aspects of hydrogen behavior in niobium is discussed and the ability of the method to determine both hydrogen concentration gradients and the presence of hydrides is demonstrated. Hydrogen embrittlement of niobium is due to the cleavage of stress induced hydrides. Portions of a typical crack which propagates in a 2.1 at% H specimen are shown. In addition to hydride formation, the ion probe technique has detected segregation of hydrogen at grain boundaries
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Journal Article
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Phys. Status Solidi A; v. 34(2); p. K97-K99
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AbstractAbstract
[en] Results of X-ray diffraction investigation of hydrogen permeability through niobium with different grain size are presented. It is established that hydrogenation results in hydrogen localization in tetrahedron positions and leads to anisotropic distortion of niobium lattice - a strong expansion in [110] direction and weak one - in [321]. At cyclic hydrogenation the coefficients of hydrogen diffusion (Dsub(H)) in niobium are calculated; Dsub(H) increases with a decrease of niobium grain size
Original Title
Vodorodopronitsaemost' i izmenenie tonkoj struktury niobiya pri navodorazhivan1i
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Source
For English translation see the journal Physics of Metals and Metallography (USA).
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Journal Article
Journal
Fizika Metallov i Metallovedenie; ISSN 0015-3230;
; v. 57(3); p. 535-542

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