Results 261 to 270 of about 32,621 (292)

Dechanneling due to dislocation loops

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1988
Abstract A theoretical description of axial dechanneling due to a special type of dislocation loops is presented. It is based on the discontinuous model with the displacement field calculated using the theory of Burgers. Using RBS data of Bentini et al. (1987) buried layers of dislocation loops in silicon are analysed.
Konrad Gärtner, Amaldo Uguzzoni
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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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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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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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Analysis of Dislocation Loops in Superlattices

physica status solidi (b), 1967
AbstractA detailed computer analysis of dislocation loop behavior in DO3 and B2 type superlattices has been performed. This analysis shows that DO3 superlattice dislocation nucleation most probably proceeds by the independent nucleation of four 1/2 a0 〈111〉 loops while the same process in B2 superlattices occurs by the independent nucleation of two ...
M. J. Marcinkowski, H. J. Leamy
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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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Continuum theory of dislocation loops

International Journal of Solids and Structures, 1965
Abstract For dislocation loops, the zeroth moment of dislocation strength always vanishes so that the first moment must be defined in order to give a continuum description. A second order tensor is thus introduced to account for the dislocation moment. This physical quantity contains more information than the macroscopic plastic strain.
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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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