ChemInform Abstract: DETERMINATION OF SMALL OXYGEN CONTENTS IN NIOBIUM BY MEASURING ELECTRICAL RESISTANCE AND INTERNAL FRICTION

Schulze, K.; Grallath, E.; Weller, Martin

doi:10.1002/chin.198139346

Cited by 5 publications

(10 citation statements)

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“…In fact, MS has been useful for detecting the movement of isolated interstitial atoms in bcc refractory metals in concentrations less than 10 atppm, during the stress-induced ordering, the so-called Snoek effect [15,44]. However, it should be emphasised that this present study involves the interaction of point defects (vacancies) with the dislocations.…”

Section: Discussionmentioning

confidence: 96%

Interaction processes between vacancies and dislocations in molybdenum in the temperature range around 0.3 of the melting temperature

Zelada-Lambri

Lambri

Bozzano

et al. 2008

Journal of Nuclear Materials

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Section: Discussionmentioning

confidence: 96%

Interaction processes between vacancies and dislocations in molybdenum in the temperature range around 0.3 of the melting temperature

Zelada-Lambri

Lambri

Bozzano

et al. 2008

Journal of Nuclear Materials

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“…While the peak width is double of the Debye peak; oxygen Snoek peak height of the present Gum Metal is only one-third of that in Nb-O with the same oxygen content 53) . Thus, the relaxation strength of oxygen atoms in Ti-Nb based alloys, including Gum Metal, is lower than that of oxygen in Nb.…”

Section: Contribution Of Oxygen Interstitialsmentioning

confidence: 57%

Basic Deformation Mechanism of Bcc Titanium-Based Alloy of Gum Metal

et al. 2016

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Single crystals and cold-swaged polycrystalline specimens of Gum Metal of Ti-36Nb-2Ta-3Zr-0.3O (mass %) have been compressed with the stress-relaxation test in the temperature range from 77 K to 450 K. In both single crystals and cold-swaged specimens, the yield stress decreases with increasing temperature rapidly to the room temperature and then gently above it forming a plateau at high temperature. The activation analysis of plastic deformation showed that the applied shear stress dependence of activation enthalpy and that of activation volume for single crystals and those for cold swaged specimens are almost identical if we shift the stress scale by about 120 MPa, meaning that the basic deformation mechanism is common to both samples. The above results are contradictory with the previously proposed non-dislocation deformation mechanism at the ideal shear strength, but consistent with the established features of usual bcc alloys, i.e., the deformation is governed by the Peierls mechanism at low temperature and by defect hardening at high temperature. τ χ − χ and ψ − χ relations of single crystals showed a typical slip asymmetry seen in bcc metals, where slip in Gum Metal belongs to the {112} slip type as in binary Ti-Nb single crystals reported previously (S. Hanada et al.: Metall. Trans. A 16 (1985) 789). Yielding by massive {332}〈113〉 twin formation in single crystals at low temperatures was observed for the rst time in Gum Metal.

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“…The electrical resistivity is a good measure to evaluated the purity, but some scatters are found among the previous reports [3][4][5][6]20,21,23] probably because of the metallic impurities. To evaluate the oxygen dependency of the electrical resistivity in our samples, 1 mm thick Nb sheets were cut off from the ingots, which had been oxygen-doped and weakly refined in the EB furnace [8,9].…”

Section: B Electrical Resistivitymentioning

confidence: 99%

“…superconductor for applications in quantum physics [1,2], where a good ductility and high thermal conductivity of thin sheet are required. Because the mechanical and physical properties of niobium are sensitive to the interstitial impurities, the removal of these impurities such as oxygen and nitrogen is essential [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Removal of oxygen and nitrogen from niobium by external gettering

Kim

Suzuki

Numakura

et al. 1997

Journal of Alloys and Compounds

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External gettering has a potential to remove interstitial gaseous impurities from solid niobium even below 1500K. The oxygen concentration in the deposit and the Nb bulk is evaluated by a combination of material thermodynamics and mass balance. The removal of oxygen and nitrogen was experimentally studied by using Ti, Y, Zr, Al and Si. Titanium deposited smoothly on the Nb surface in vacuum, and absorbed the gaseous impurities most efficiently. By applying Ti as an external getter on commercial niobium at 1463K, the residual resistivity ratio (RRR) reached 780.The oxygen distribution was calculated by combining thermodynamics and diffusion data. The experimental deoxidation rate was found to be slower than the calculated value. This may be attributed to the slow growth of the deposited layer, its morphology, and the interdiffused Ti-Nb alloy layer.

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ChemInform Abstract: DETERMINATION OF SMALL OXYGEN CONTENTS IN NIOBIUM BY MEASURING ELECTRICAL RESISTANCE AND INTERNAL FRICTION

Cited by 5 publications

References 0 publications

Interaction processes between vacancies and dislocations in molybdenum in the temperature range around 0.3 of the melting temperature

Interaction processes between vacancies and dislocations in molybdenum in the temperature range around 0.3 of the melting temperature

Basic Deformation Mechanism of Bcc Titanium-Based Alloy of Gum Metal

Removal of oxygen and nitrogen from niobium by external gettering

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