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dislocations
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Image
Published: 01 January 1986
Fig. 13 Lang topograph of a silicon crystal showing dislocations, including a Frank-Read source and thickness fringes. Source: Ref 20
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Published: 01 January 1986
Fig. 23 Bright-field image of polycrystalline aluminum showing dislocations as they often appear in metallic crystals. The dislocations appear as dark curved lines and exhibit dark contrast relative to the matrix due to the distortion of the atomic planes near the dislocations
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Image
Published: 01 January 1986
Fig. 58 Elastic displacement field associated with dislocations. (a) An edge dislocation at which the perfect part of the crystal is oriented far from the Bragg angle. (b) The transmitted intensity, I t , as a function of depth, z , below the entrance surface of the thin crystal
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Published: 01 January 2005
Fig. 14 Dense tangles of dislocations forming a cell structure in iron that was deformed at room temperature to 9% strain (a) and to 20% strain (b). Note that the average spacing between cell walls decreased as strain was increased. Thin-foil electron micrographs. Original magnification 20,000×
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Published: 01 January 2005
Fig. 10 (a) Geometry of a row of edge dislocations, causing a misorientation between the two sections of the crystal. (b) Polished and etched surface of a germanium crystal revealing a subboundary by the row of etch pits associated with the dislocation cores. Reprinted from Ref 7 . Source
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Published: 01 January 2005
Fig. 22 (a) X dislocation sources per unit volume emit dislocations over a radius L . Continued emission (and hence strain) requires that the outermost dislocations in each loop be annihilated by climb processes between nearby loops separated by the distance h . (b) A two-dimensional view
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Published: 01 January 2005
Fig. 1 Slip and dislocations. (a) Ideal crystal. (b) Plastic deformation by slip in an ideal crystal from shear stress (τ)
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Published: 01 January 1996
Fig. 10 Schematic representation of a cross slip process of several dislocations at an obstable (X), if (a) planar slip or (b) wavy slip prevails. Source: Ref 24
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Published: 01 June 2016
Fig. 2 Dislocations, which have “knitted” themselves into small-angle subboundaries, in a specimen of unalloyed nickel that was cold rolled to a reduction of 8% and then annealed for 2 h at 600 °C (1110 °F). Thin-foil transmission electron microscopy specimen. Original magnification: 10,000×
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Image
Published: 01 January 2006
Fig. 22 (a) X dislocation sources per unit volume emit dislocations over a radius L . Continued emission (and hence strain) requires that the outermost dislocations in each loop be annihilated by climb processes between nearby loops separated by the distance h . (b) A two-dimensional view
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Published: 31 December 2017
Fig. 12 (a) Ashby and (b) Orowan models for interaction of dislocations with coherent and incoherent precipitates
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Published: 01 June 2012
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Published: 01 December 1998
Fig. 10 Effect of dislocations introduced by cold working and removed by annealing on width of diffraction peaks in brass. Source: Ref 1
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Published: 01 December 1998
Fig. 18 Transmission electron microscopy imaging of dislocations in aluminum. Source: Ref 3
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Published: 15 December 2019
Fig. 5 (a) Synchrotron transmission topograph of superscrew dislocations in 6H-SiC ( g = 0006). (b) Simulation of pure orientation contrast of a 5 c superscrew dislocation
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Published: 15 December 2019
Fig. 43 Coordinated scanning electron microscope analysis of threading dislocations in a GaN (0002) single crystal using (a) electron channeling contrast imaging and (b) cathodoluminescence. Reprinted from Ref 59 with permission of Cambridge University Press
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Published: 01 December 2009
Fig. 11 Critical condition for barrier-less nucleation of slip dislocations in stress field of plate periphery. Source: Ref 56
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Published: 01 December 2009
Fig. 13 Flow chart schematically illustrating the behavior of dislocations produced by strain hardening during continuous dynamic recrystallization (hatched arrows), the continuous increase of low-angle boundary (LAB) misorientations (gray arrows), and the absorption of dislocations
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Published: 01 December 2009
Fig. 10 Dislocations (shown as the boundaries between slipped and unslipped regions) in the γ/γ′ microstructure of −0.3% lattice misfit under 152 MPa [001] tensile stress. Cross-sectional view on the slip plane for (b) 1 / 2 [ 101 ] ( 1 ¯ 1 ¯ 1 ) dislocations
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Published: 01 December 2009
Fig. 12 Discrete dislocations and a continuum field of the inelastic (plastic) strain field (dotted and shadowed regions) that yields the same plastic deformation at a coarse-grained length scale (much greater than dislocation core size). (Model output images are in color.)
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