Results 131 to 140 of about 58,697 (194)

Dislocation loops in antimony telluride

Physica Status Solidi (a), 1971
The investigation of the diffraction contrast of large hexagonal dislocation loops in Sb2Te3 suggests that nearly all of them are multiple loops. A model which explains satisfactorily the contrast is described. At elevated temperatures the loops do not shrink but take a circular equilibrium shape.
P . Skalicky, E . Wolfgang
openaire   +1 more source

Dislocation Loops in α-Iron

Physica Status Solidi (a), 1978
The equilibrium shapes of dislocation loops in α-iron under the action of a given shear stress are computed, taking into account the effects of elastic anisotropy on the line tension. In fair agreement with these calculations, dislocation loops observed by transmission electron microscopy of cyclically deformed α-iron single crystals are found to be ...
H. O. K. Kirchner   +3 more
openaire   +1 more source

Energy of hexagonal dislocation loops

physica status solidi (b), 1966
AbstractThe elastic strain energy of an elongated hexagonal dislocation loop is calculated from the stress field of dislocation segments using isotropic elasticity theory. Energies of rhombus dislocation loops and rectangular dislocation loops are presented as limiting cases.
G. C. T. Lxu, J. C. M. Li
openaire   +1 more source

Residual image contrast of dislocation loops

Physica Status Solidi (a), 1978
The electron microscope images of large dislocation loops lying perpendicular to the electron beam are calculated by applying the image simulation technique. It is found that the residual double arc contrast arising from the g · b × u term exhibits asymmetry which is depth dependent.
J. Narayan, S. M. Ohr
openaire   +1 more source

Cooperative Nucleation of Shear Dislocation Loops

Physical Review Letters, 2002
The mean elastic interaction between randomly distributed transient subcritical shear loops of the same sign, formed in the presence of an applied shear stress, is the "image stress." This stress is proportional to the volume density of loops and has the same sign as the applied stress.
Y Q, Sun, P M, Hazzledine, P B, Hirsch
openaire   +2 more sources

Dislocation loops in diamond

Philosophical Magazine, 1962
Abstract Mat triangular plates of diamond have been thinned sufficiently by oxidation at high temperatures for an examination to be carried out by transmission electron microscopy. By suitably tilting the specimens all the diamonds examined have been shown to contain dislocation loops.
T. Evans, C. Phaal
openaire   +1 more source

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