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edge dislocations

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2021
DOI: 10.31399/asm.tb.ciktmse.t56020001
EISBN: 978-1-62708-389-8
..., and how they respond to applied stresses and strains. The chapter makes extensive use of graphics to illustrate crystal lattice structures and related concepts such as vacancies and interstitial sites, ion migration, volume expansion, antisite defects, edge and screw dislocations, slip planes, twinning...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2021
DOI: 10.31399/asm.tb.ciktmse.9781627083898
EISBN: 978-1-62708-389-8
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2021
DOI: 10.31399/asm.tb.ciktmse.t56020013
EISBN: 978-1-62708-389-8
... of twinning planes on stacking sequences. The chapter also includes problems on how the formation of precipitates can produce slip planes and how grain boundaries can act as obstacles to dislocation motion. dislocation mobility edge dislocations glide plane grain boundaries miscibility pinning...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240017
EISBN: 978-1-62708-251-8
... of the most important defects is the line or edge dislocation. The existence of line defects in crystals, called dislocations, provides the mechanism that allows mechanical deformation. A crystalline metal without dislocations, although extremely strong, would also be extremely brittle and practically useless...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410017
EISBN: 978-1-62708-265-5
... Figure 3.16 shows schematically the movement of an edge dislocation in a section of a crystal structure where the atoms are regularly aligned except at the dislocation. The dislocation moves in response to an applied shear stress (arrows). The atomic displacements associated with an edge dislocation...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240041
EISBN: 978-1-62708-251-8
... the lattice, and a smaller solute atom contracts the matrix. These strains can be reduced if the solute atoms migrate to an edge dislocation. Large solute atoms are attracted to lattice positions below the dislocation where the lattice is expanded, and small solute atoms are attracted to lattice positions...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410213
EISBN: 978-1-62708-265-5
... and limited ability to plastically deform. Figure 11.7 also shows low-temperature elastic limits, σ E , and anelastic limits, σ A , the stresses, respectively, for reversible edge dislocation motion and for long-range motion of edge dislocations. Fig. 11.7 Temperature dependence of yield and flow...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420363
EISBN: 978-1-62708-310-2
... less than 5°. These small-angle misorientations can be represented by a row of somewhat parallel edge dislocations, as shown for the low-angle tilt boundary in Fig. A.48 . The regions between the dislocations consist of an almost perfect fit and have low strain, while regions at the dislocation cores...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310001
EISBN: 978-1-62708-326-3
... Point defects: A, interstitial atom; B, vacancy; C, foreign atom in lattice site Fig. 7 Section through an edge dislocation (indicated by the symbol ⊥) with an axis perpendicular to the plane of the illustration and line dislocation. (a) Positive edge dislocation, (b) negative edge dislocation...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420171
EISBN: 978-1-62708-310-2
..., a defect in the atomic arrangement caused by the presence of a dislocation can cause the atomic sequence to be out of step and thus generate an APB (lower section of Fig. 9.13 ). The amount of dislocation-generated APBs can be minimized if dislocation pairs (for example, two edge dislocations) align...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060013
EISBN: 978-1-62708-261-7
... dislocation (indicated by the symbol ⊥) with an axis perpendicular to the plane of the illustration and line dislocation. (a) Positive edge dislocation, (b) negative edge dislocation Fig. 2.14 Four stages of slip deformation by formation and movement of a dislocation (dashed line) through a crystal...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870375
EISBN: 978-1-62708-344-7
... Packing of hexagonal structure. Source: Ref A.16 Fig. A.11 Illustration of the process of permanent deformation by twinning. See text for discussion. Source: Ref A.22 Fig. A.13 Edge dislocation. (a) Atomic arrangement in a plane normal to edge dislocation. (b) Movement of an edge...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240117
EISBN: 978-1-62708-251-8
... impurities and alloying elements are attracted to both vacancies and dislocations, their presence decreases the mobility of the defects. One of the key processes of dislocation rearrangement is polygonization. Polygonization is the process of rearranging excess edge dislocations into low-angle tilt...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.ex2.t69980141
EISBN: 978-1-62708-342-3
... line in a slip plane can be considered to consist of edge and screw elements. The dislocation line consists of a closed ring or ends at a grain boundary or particle. In an undeformed structure, there can be up to 1 km of dislocation lines/mm 3 (dislocation density 10 6 to 10 8 /cm 2 . Fig. 4.5...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060001
EISBN: 978-1-62708-343-0
... 1.1 ). To emphasize the role of grain boundaries, we include the next two illustrative figures. A small-angle tilt boundary is shown in Fig. 1.5 , illustrating how edge dislocations combine to make it possible for adjacent grains to have different crystallographic orientations. Grain boundaries...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1983
DOI: 10.31399/asm.tb.mlt.t62860237
EISBN: 978-1-62708-348-5
... directions perpendicular to the paper. This essentially one-dimensional region of atomic mismatch accompanied by high stresses is known as an edge dislocation. Figure 7.2c shows that when the edge dislocation has traversed the whole crystal, an increment of strain has been produced. Another dislocation...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.fdsm.t69870237
EISBN: 978-1-62708-344-7
... role in creating dislocations, breaking up grains into subgrains, and causing microscopic imperfections to coalesce into larger flaws. It also discusses the factors that contribute to the development and propagation of fatigue cracks, including surface deterioration, volumetric and environmental...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430027
EISBN: 978-1-62708-253-2
... by misalignment of atoms surrounding it. There are two types of dislocations: edge dislocations and screw dislocations. Typical values for the density of dislocations in a metal in an annealed condition are 10 10 to 10 12 per m 2 ( Ref 3.1 ). An edge dislocation causes lattice distortion along the end...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110524
EISBN: 978-1-62708-247-1
... at the edge of the device and traveling toward the stripe. Fig 3 Top view of typical stripe laser (left) and VCSEL (right) show how small a portion of the total die area is actually used to create light. The die area is shown in black, with the pumped area shown in white to scale. At the upper left...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540357
EISBN: 978-1-62708-309-6
... (dislocation) from a position in (a) to the edge in (c). The vector b is the Burgers vector, which is defined as the unit displacement of a dislocation. Source: Ref A1.1 Slip from shear stress is the most common deformation mechanism within crystalline lattices of metallic materials, although...