Results 231 to 240 of about 16,888 (264)

Dislocation loops in irradiated zirconium

Philosophical Magazine, 1966
Abstract Transmission electron microscope observations of damage in zirconium irradiated with krypton ions are reported. Dislocation loops were observed in irradiated and annealed specimens. These loops were interstitial in nature, fault free and were oriented near primary and secondary prism planes. The Burgers vectors were of the type b=(α/3) . It is
T. D. Gulden, I. M. Bernstein
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Dislocation loops in quenched aluminium

Philosophical Magazine, 1958
Abstract Electron transmission micrographs of polycrystalline aluminium quenched from ∼ 600°c into iced brine show that the specimens contain many dislocation loops with diameters of the order of several hundred A. Some of the loops are hoxagonal in shape, and occur on (111) planes, and have a Burgers vector ½ [110] not in the plane of the loop.
P. B. Hirsch, J. Silcox, R. E. Smallman, K. H. Westmacott   +3 more
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The energy of rectangular dislocation loops

Philosophical Magazine, 1962
Abstract Exact expressions are given for the energy of a single rectangular dislocation loop and for a close pair of such loops. These are compared with the useful approximations derived by treating the dislocation loops as segments of pairs of infinite, parallel dislocations of unlike sign.
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Modeling of the kinetics of dislocation loops

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1999
Abstract The precipitation of excess silicon interstitials into dislocation loops is modeled. This situation occurs when an amorphous layer is created at the surface in order to avoid boron channeling and form shallow p junctions. The modeling of the nucleation of these extended defects is included into the process simulator IMPACT-4. Their density
E. Lampin, V. Senez
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Circular dislocation loops in bimaterials

Journal of Physics: Condensed Matter, 1991
The solution of the elastic field in bimaterials due to a circular dislocation loop of arbitrary orientation within one of the materials is presented. The bimaterial is idealized as two semi-infinite isotropic elastic solids either perfectly bonded together or in frictionless contact with each other at the planar interface.
H Y Yu, S C Sanday
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Continuous distribution of dislocation loops

Czechoslovak Journal of Physics, 1962
Formulae are derived for the displacement and stress in an unbounded continuous isotropic medium when the dislocation loops are continuously distributed. The physical interpretation of the tensor introduced for the dislocation loop density in the crystal is discussed and the relation to the theory of the continuous distribution of dislocations is ...
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Size distribution of dislocation loops

Acta Metallurgica, 1973
Abstract The annealing behavior of dislocation loops in aluminium obtained by bulk quenching is discussed. If the mean distance between loops is small compared with the grain-size of the specimen, the total number of vacancies condensed in loops remains constant, whilst the difference of chemical potential at loops of different sizes provides a ...
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The spacing of prismatic dislocation loops

Philosophical Magazine, 1960
Abstract The stresses round a circular prismatic dislocation loop are determined and used to calculate the spacings between such loops in a row generated from a source of internal stress. The results are consistent with the available experimental observations.
R. Bullough, R. C. Newman
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Energy of elliptical dislocation loops

Philosophical Magazine, 1966
Abstract The strain energy of an elliptical dislocation loop of arbitrary Burgers vector is obtained analytically using isotropic elasticity theory.
James C. M. Li, Gaines C. T. Liu
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Dislocation loops in hexagonal crystals

Journal of the Mechanics and Physics of Solids, 1974
Summary In this paper, E. Kroner's representation of the Green's function is first used to derive closed-form solutions for the components of the displacement and stress fields created by an arbitrary dislocation loop situated in a basal plane of a hexagonal crystal. The interaction energy of two dislocation loops in basal planes is then calculated.
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