Journal ArticleDOI
Diffusion of helium gas bubbles in gold and copper foils
L. E. Willertz,P. G. Shewmon +1 more
- Vol. 1, Iss: 8, pp 2217-2223
TLDR
In this paper, it was shown that the nucleation of steps on the faceted surface of the bubbles could satisfactorily account for the abnormally slow bubble diffusion rate, which would inhibit the motion of bubbles in more anisotropic solids like oxides.Abstract:
Helium bubbles were induced in gold and copper foils by ion bombardment and their diffusion studied by observing the rate at which the bubbles diffuse out of the foil and also by measuring the distance they move in a given annealing time. This is the first time such quantitative comparisons have been made. It was discovered that helium bubbles in gold diffuse at a rate 10-4 to 10-5 times that predicted by surface diffusion and that helium bubbles in copper diffuse at 10-5 to 10–2 the predicted rate. It is shown that the nucleation of steps on the faceted surface of the bubbles could satisfactorily account for the abnormally slow bubble diffusion rate. Such a process would inhibit the motion of bubbles in more anisotropic solids like oxides even more.read more
Citations
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Journal ArticleDOI
Gas release mechanisms in UO2—a critical review
TL;DR: In this article, the first and basic step in gas release is single gas atom diffusion and the lattice location of rare gas atoms in the UO2 lattice and the mechanism of this diffusion process are discussed.
Journal ArticleDOI
Particle growth in model supported metal catalysts—I. Theory
Paul Wynblatt,N.A. Gjostein +1 more
TL;DR: A theoretical study of capillarity driven growth has been performed for several regimes of importance to the ripening of noble metal particles supported on flat, partially wetted, metal oxide substrates as discussed by the authors.
Journal ArticleDOI
Growth and structure of supported metal catalyst particles
TL;DR: In this article, the authors review current understanding of the growth and structure of supported metal catalyst particles, and discuss the extent to which experimental observations can be reconciled with theoretical predictions.
Journal ArticleDOI
Microstructural evolution in annealed austenitic steels during neutron irradiation
Philip J. Maziasz,C. J. McHargue +1 more
TL;DR: In this paper, the microstructural development during neutron irradiation of austenitic stainless steels is reviewed, with emphasis on solution annealed AISI 316 stainless steel.
References
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Journal ArticleDOI
Calculated Size Distributions for Gas Bubble Migration and Coalescence in Solids
TL;DR: In this article, a finite difference approach is used to predict the variation of the number of bubbles per unit volume as a function both of bubble size and of post-irradiation annealing time.
Journal ArticleDOI
A theory of swelling and gas release for reactor materials
TL;DR: In this article, the authors used the physical mechanisms deduced from the direct observation of inert gas bubbles in the electron microscope to evolve a model, or theory, for swelling, which assumes the insolubility of the inert gases and the bodily migration of the gas bubbles, and relies upon the equation of state for the inert gas, upon the surface energy, surface self-diffusion coefficient, and the lattice parameter of the solid, and upon some internal driving force, which is believed to be related to the line tension of dislocation lines.
Journal ArticleDOI
The Migration and Coalescence of Inert Gas Bubbles in Metals
R. S. Barnes,D. J. Mazey +1 more
TL;DR: In this paper, it was shown that helium (the smallest inert gas atom) was unable to dissolve in copper, even at high temperature, and it was concluded that no bubble was observed to reduce in size during its migration.
Journal ArticleDOI
Migration of gas bubbles in irradiated uranium dioxide
TL;DR: In this paper, the fission gas bubble migration in irradiated UO2 was studied using electron microscopy, under isothermal annealing conditions at 1400, 1450 and 1500° C.