Results 221 to 230 of about 41,725 (261)

Effect of trapping on hydrogen permeation

Metallurgical Transactions A, 1975
Approximate solutions were obtained to the nonlinear partial differential equations derived by A. McNabb and P. K. Foster for a general model of diffusion-plus-trapping. The finite-difference method was applied to their equations for boundary conditions appropriate to hydrogen permeation and evolution in a plane. Solutions are shown to be stable and to
George R. Caskey, William L. Pillinger
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Trapping of hydrogen in metals

1978
| 1 Hydrogen can be trapped in many kinds of defects in solids. The binding energy of trapping is of the same order as that for other interstitials (C, N, and O) to defects— few tenths of an eV. However, the high mobility of hydrogen in metals permits equilibrium to be established at much lower temperatures than is true of the other interstitials
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Titanium: a hydrogen trap in iron

Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1980
Abstract The presence of titanium in iron, either as a dissolved substitutional solute or combined as a carbo-nitride, has been shown to affect the susceptibility of these alloys to hydrogen embrittlement. This behaviour is a direct result of the ability of these titanium-rich centres to capture hydrogen.
G. M. Pressouyre, I. M. Bernstein
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Hydrogen Trapping in Mixed Carbonitrides

Acta Materialia, 2023
Philipp Hammer, Lorenz Romaner, Vsevolod I. Razumovskiy   +2 more
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Precipitation and trapping of hydrogen in copper

Philosophical Magazine, 1976
Abstract Copper samples containing dissolved hydrogen up to a few hundred atomic p.p.m. have been prepared by quenching from equilibrium at higher temperatures. Measurements of the annealing of the residual resistivity up to 150°C show that the hydrogen precipitates around room temperature and the precipitation is controlled by diffusion of the ...
W. R. Wampler, T. Schober, B. Lengeler
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Trapping and cooling of (anti)hydrogen

Hyperfine Interactions, 1993
Magnetic traps offer the possibility for long-term storage and accumulation of atomic antihydrogen. These are invaluable features for revealing subtle differences that may exist between hydrogen and antihydrogen in interaction with electromagnetic or gravity fields. An overview is given of various aspects associated with trapping and cooling of neutral
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Multivacancies trapping hydrogen molecules

Physica B: Condensed Matter, 2001
Abstract Hydrogen molecule has been observed in ion-implanted silicon and attributed to be trapped in a multi-vacancy (H 2 (MV)). In order to clarify the structure of the multi-vacancy trap of H 2 (MV), we investigated correlation between thermal annealing of multi-vacancies and H 2 (MV). The results indicated that the main multi-vacancy trap is an H-
T. Mori, K. Otsuka, N. Umehara, K. Ishioka, M. Kitajima, S. Hishita, K. Murakami   +6 more
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Some Remarks on Hydrogen Trapping

International Journal of Fracture, 2000
A model for the pressure-dependent diffusion and accumulation of hydrogen ahead of a decohesive intergranular crack front is developed. In the model, the pressure dependency of the diffusion is incorporated into the activation energy of an Arrhenius form of the material diffusivity along high-diffusivity grain boundaries.
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Trapping hydrogen with a bimetallic interface

Physical Review B, 2005
We report results of a study on the interaction of hydrogen with thin Au films grown on an Ir{111} surface at $\ensuremath{\approx}100\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, using nuclear reaction analysis and first-principles calculations. We found that H atoms can be confined at the interface between the bulk-Ir surface and the Au thin film, which is
Michio Okada, Kousuke Moritani, Toshio Kasai, Wilson Agerico Diño, Hideaki Kasai, Shouhei Ogura, Markus Wilde, Katsuyuki Fukutani   +7 more
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Hydrogen trapping models in steel

Metallurgical and Materials Transactions B, 2000
This article describes the role of hydrogen trapping in steel. Trapping increases the solubility of hydrogen and decreases the diffusivity. Traps are characterized by their nature, i.e., reversible or irreversible, saturable or unsaturable. A dislocation core is a saturable, reversible trap, while voids and crack are unsaturable, reversible traps.
Alfons H. M. Krom, Ad Bakker
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