Results 261 to 270 of about 18,192 (300)

Energy of dislocation loops in crystals

physica status solidi (a), 1986
Methods of calculating the energy of dislocation loops of arbitrary type and size as well as their interaction are proposed in a model of the solid state as a non-localized quasi-continuum. Also the model of a Gauss distribution of the dislocation density for a single dislocation is considered.
A. F. Vladimirov, E. N. Moos
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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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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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The long-range forces between dislocation loops and dislocations

The Philosophical Magazine: A Journal of Theoretical Experimental and Applied Physics, 1964
The long-range elastic interactions between dislocations and loops, both prismatic and shear, have been calculated for an isotropic medium.
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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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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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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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The climb of dislocation loops in zinc

Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1966
Abstract The annealing behaviour of faulted dislocation loops in quenched zinc has been studied with the aid of the electron microscope. On annealing, it is observed that some of the loops grow rather than shrink, and this has been attributed to the growth of zinc oxide on the foil surface, which results in the formation of vacancies.
P. S. Dobson, Raymond Edward Smallman
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Analysis of passing dislocation loops

Physica Status Solidi (a), 1974
The equilibrium configurations of passing dislocation loops on parallel slip planes have been determined as a function of applied stress using numerical techniques. It is shown that the stable equilibrium configurations of the loops correspond to minima in the energy surface determined by two loop radii, while the unstable equilibrium configurations ...
K. Sadananda, M. J. Marcinkowski
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