Closure to “Discussion of ‘Equilibria in the Niobium-Hydrogen System’ [W. M. Albrecht, M. W. Mallett, and W. D. Goode (pp. 219–223, Vol. 105)]”

Albrecht, W.M.; Mallett, M. W.; Goode, W.D.

doi:10.1149/1.2428727

Cited by 29 publications

(43 citation statements)

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“…The a-b solvus line was determined by using resistivity, [21][22][23] internal friction 24 and DTA 25 methods. Since niobium itself has a cubic body-centered crystal structure, the formation of b-phase is accompanied by about 11.9% molar volume increase, [26][27][28] leading to a deformation of the a)…”

Section: Introductionmentioning

confidence: 99%

Precipitation of hydrides in high purity niobium after different treatments

Barkov

Romanenko

Trenikhina

et al. 2013

Journal of Applied Physics

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Precipitation of lossy non-superconducting niobium hydrides represents a known problem for high purity niobium in superconducting applications. Using cryogenic optical and laser confocal scanning microscopy, we have directly observed surface precipitation and evolution of niobium hydrides in samples after different treatments used for superconducting RF cavities for particle acceleration. Precipitation is shown to occur throughout the sample volume, and the growth of hydrides is well described by the fast diffusion-controlled process in which almost all hydrogen is precipitated at T = 140 K within ∼30 min. 120 °C baking and mechanical deformation are found to affect hydride precipitation through their influence on the number of nucleation and trapping centers.

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Section: Introductionmentioning

confidence: 99%

Precipitation of hydrides in high purity niobium after different treatments

Barkov

Romanenko

Trenikhina

et al. 2013

Journal of Applied Physics

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“…DISCUSSION mination, in combination with the hydrogen contents established within the specimens, ensures an excellent accuracy The diffusion coefficients obtained for the beta titanium alloys lie in a reasonable range compared to the values of the measured concentration profiles. Sample preparation as a major source of error was widely excluded, since cutting reported in the literature, [25][26][27][28][29][30][31][32][33][34][35] which were measured at higher temperatures for pure beta titanium (Figure 12). It of the rods took place at room temperature immediately after diffusion annealing so that additional hydrogen diffusion should be noted that because of the experimental procedure applied, the diffusion data of this study are not affected by along the rod axis should have a negligible effect.…”

Section: Resultsmentioning

confidence: 99%

Hydrogen diffusion coefficients in the titanium alloys IMI 834, Ti 10-2-3, Ti 21 S, and alloy C

Christ

Decker

Zeitler

2000

Metall Mater Trans A

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The diffusion coefficients of hydrogen were determined for three beta titanium alloys, which differ in the stability of the beta phase, and, for comparison, for one near-alpha titanium alloy in the temperature range from 40 ЊC to 500 ЊC. For this purpose, a step hydrogen concentration profile was produced by charging one side of rods of these materials with hydrogen by means of an electrochemical technique. After subsequent diffusion annealing, the hydrogen concentration profiles were determined analyzing small discs cut from these rods. The corresponding diffusion coefficient was calculated by adapting its value in such a way that a numerical diffusion simulation yields the experimentally determined profile. In all cases studied, the hydrogen diffusion coefficient was found to be independent of the hydrogen concentration and showed an Arrhenius-type temperature dependence. Hydrogen diffusion in alpha titanium was slower as compared to the beta titanium alloys under investigation. Furthermore, the diffusion coefficient of the metastable beta titianium alloys is only slightly affected by the prior heat treatment that determines the morphology and volume fraction of the precipitated alpha phase.

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“…(1) The niobium-hydrogen equilibrium has been studied in the temperature range of 100 to 900 C and O. 1 to 1000 Torr hydrogen pressure, (2) and also in the (3) temperature range of 300 to 1500 C and 0 to 760 Torr hydrogen pressure. Figure 1 shows the equilibrium sorption isotherms plotted as external hydrogen pressure versus hydrogen/niobium atomic ratio.…”

Section: Discussionmentioning

confidence: 99%

Reaction of Hydrogen With Niobium and Tantalum in the Atr Gas Loop

Charlot¹

1965

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Closure to “Discussion of ‘Equilibria in the Niobium-Hydrogen System’ [W. M. Albrecht, M. W. Mallett, and W. D. Goode (pp. 219–223, Vol. 105)]”

Abstract: not Available.

Cited by 29 publications

References 0 publications

Precipitation of hydrides in high purity niobium after different treatments

Precipitation of hydrides in high purity niobium after different treatments

Hydrogen diffusion coefficients in the titanium alloys IMI 834, Ti 10-2-3, Ti 21 S, and alloy C

Reaction of Hydrogen With Niobium and Tantalum in the Atr Gas Loop

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