Photographs of the Stress Field Around Edge Dislocations

1956 ◽  
Vol 101 (3) ◽  
pp. 1211-1211 ◽  
Author(s):  
W. L. Bond ◽  
J. Andrus
Keyword(s):  
Stress Field ◽  
Edge Dislocations

Computer Simulation of Core Structure and Stress Field of Edge Dislocations in C60Crystals Using Girifalco Potential

1998 ◽  
Vol 37 (Part 1, No. 11) ◽  
pp. 6115-6116 ◽  
Author(s):  
Shigeru Tamaki ◽  
Naoki Ide ◽  
Isamu Okada ◽  
Kenichi Kojima
Keyword(s):  
Computer Simulation ◽  
Stress Field ◽  
Core Structure ◽  
Edge Dislocations

scholarly journals Crystal Dislocations and Coercivity in Fine Grained Magnetite

1967 ◽  
Vol 20 (5) ◽  
pp. 507 ◽  
Author(s):  
FD Stacey ◽  
KN Wise
Keyword(s):  
Grain Size ◽  
Domain Wall ◽  
Stress Field ◽  
Potential Well ◽  
Oriented Edge ◽  
Screw Dislocations ◽  
Fine Grained ◽  
Ferromagnetic Domain ◽  
Edge Dislocations ◽  
Ferromagnetic Domain Wall

Interaction of the stress field of a favourably oriented edge dislocation with the magnetostriction in a ferromagnetic domain wall in magnetite causes the dislocation to act as a potential well for the domain wall. The coercivity of 20 pm. grains, in which the domain structure is considered to be particularly simple, can be explained on this basis if the dislocations are arranged so that the effects of several of them are additive. The required density of edge dislocations is 109 cm-2, which is entirely reasonable; screw dislocations are not effective in magnetite. To explain the variation of coercivity with grain size it appears necessary to assume that the arrangement of dislocations is neither regular nor random but is partially ordered.

Observation of secondary slip systems in tungsten bicrystals

1984 ◽  
Vol 42 ◽  
pp. 478-479
Author(s):  
J. R. Fekete ◽  
R. Gibala
Keyword(s):  
Stress Field ◽  
Grain Boundaries ◽  
Deformation Behavior ◽  
Stress Axis ◽  
Polycrystalline Materials ◽  
Slip Systems ◽  
Metallic Materials ◽  
Twist Boundary ◽  
Secondary Slip ◽  
Plane Normal

The deformation behavior of metallic materials is modified by the presence of grain boundaries. When polycrystalline materials are deformed, additional stresses over and above those externally imposed on the material are induced. These stresses result from the constraint of the grain boundaries on the deformation of incompatible grains. This incompatibility can be elastic or plastic in nature. One of the mechanisms by which these stresses can be relieved is the activation of secondary slip systems. Secondary slip systems have been shown to relieve elastic and plastic compatibility stresses. The deformation of tungsten bicrystals is interesting, due to the elastic isotropy of the material, which implies that the entire compatibility stress field will exist due to plastic incompatibility. The work described here shows TEM observations of the activation of secondary slip in tungsten bicrystals with a [110] twist boundary oriented with the plane normal parallel to the stress axis.

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