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dislocation boundaries

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Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003742
EISBN: 978-1-62708-177-1
...Glossary of structural features and nomenclature Table 1 Glossary of structural features and nomenclature Term Definition Bamboo incidental dislocation boundary (IDB) An incidental dislocation boundary observed at large strain that is connected to geometrically necessary boundaries...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004020
EISBN: 978-1-62708-185-6
... creep, dislocation creep with diffusional accommodation at grain boundaries, and concepts of grain-mantle deformation. The article concludes with information on the kinetics of superplastic deformation processes, including low stress behavior, concurrent grain growth, and high stress behavior...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003784
EISBN: 978-1-62708-177-1
...Abstract Abstract Pure metals normally solidify into polycrystalline masses, but it is relatively easy to produce single crystals by directional solidification from the melt. This article illustrates the dislocations present in a metal crystal, which is often polygonized into sub-boundaries...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003733
EISBN: 978-1-62708-177-1
..., their dislocations and degrees of ordering (long and short order). It focuses on the common superlattice structures and ordered phases observed in copper-gold and iron-aluminum alloy systems. These superlattice types can be referred to by Strukturbericht symbols and the prototype phase. antiphase boundaries...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004027
EISBN: 978-1-62708-185-6
... in the cell interiors (ρ i ), and immobile dislocations in the cell walls (ρ w ). Source: Ref 33 Fig. 16 (a) Transmission electron micrograph of an interstitial-free steel deformed 20% in tension at room temperature. (b) Dislocation substructure: cell block boundaries (CBBs) parallel to the {110...
Book Chapter

Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003736
EISBN: 978-1-62708-177-1
... Reaction and symbol (if designated) Comments °C °F −40 to 100 −40 to 210 Clustering of two to four carbon atoms on octahedral sites of martensite; segregation of carbon atoms to dislocation boundaries Clustering is associated with diffuse spikes around fundamental diffraction spots...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005413
EISBN: 978-1-62708-196-2
... of deformation, with continuously increasing frequency as deformation proceeds. Hardening is due to clustering of dislocations in local tangles, which are spatially d in a loose cell wall structure and, for example, could be envisaged as the incidental dislocation boundaries, identified in TEM studies by Hansen...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.9781627081771
EISBN: 978-1-62708-177-1
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004019
EISBN: 978-1-62708-185-6
... level. All three processes involve diffusion and thus depend on thermal activation to cause rearrangement of dislocations and grain boundaries. The mechanisms of recovery and recrystallization also depend on the extent of plastic deformation (either during hot working or by cold work prior to annealing...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004018
EISBN: 978-1-62708-185-6
... to the center or to the location of the midrib. The dislocation walls can be seen in Fig. 37 , which shows the full width of a twin band in deformed iron. Figure 37 also shows that each twin boundary, although a plane that is coherent with the twin and matrix lattices, contains a high density of dislocations...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005433
EISBN: 978-1-62708-196-2
...-to-microcrystalline state. Source: Ref 44 Fig. 2 Grain switching in Ashby-Verrall model. Source: Ref 24 Fig. 5 Core-mantle theory with accommodation by dislocation motion in and near grain boundaries. Source: Ref 34 Fig. 3 Schematic illustration of the Ball-Hutchison mechanism...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003743
EISBN: 978-1-62708-177-1
... are outlined by broad boundaries. Note that these thin-foil specimens for transmission electron microscopy (TEM) were prepared parallel to the rolling plane of the strip. The heavily cold-worked (90%) strip examined parallel to the rolling direction and shown in Fig. 3 has such a high dislocation density...
Book Chapter

By Sammy Tin
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005404
EISBN: 978-1-62708-196-2
.... A constitutive description of the strain-rate-dependent behavior of engineering alloys must take into account the intrinsic causes of damage accumulation in the form of cavitation, dislocation evolution, and grain-boundary sliding. Moreover, because creep occurs at elevated temperatures, seldom does...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005412
EISBN: 978-1-62708-196-2
... energy are composed of periodic arrangements of such units, and grain boundaries with different orientations are a mixture of SUs. Source: Ref 15 Because the two crystals must be strained to permit SUs to be built at their interface, there are dislocations between different kinds of SUs. Thus...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005455
EISBN: 978-1-62708-196-2
... Transmission Current State of Understanding and Modeling of Strengthening Mechanisms Examples of Predictive Models Atomistic Modeling of Dislocation Structures and Slip Transmission Legacy Understanding Modeling Grain-Boundary Strengthening Legacy Understanding Modeling Strengthening...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005183
EISBN: 978-1-62708-186-3
...)</xref> Research on the mechanism of superplastic flow in fine-grain metals has encompassed many ideas, such as diffusional creep ( Ref 39 , Ref 40 , 41 ), dislocation creep ( Ref 42 , 43 ) with diffusional accommodation at grain boundaries ( Ref 35 ), concepts of grain-mantle deformation ( Ref 44 , 45...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005403
EISBN: 978-1-62708-196-2
... of crystallites. High- and low-angle grain boundaries are represented with thick and fine lines, respectively. Fig. 13 Flow chart schematically illustrating the behavior of dislocations produced by strain hardening during continuous dynamic recrystallization (hatched arrows), the continuous increase...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006284
EISBN: 978-1-62708-169-6
.... In these metals, the dislocations rearrange themselves to form cells, the cores of which contain few dislocations and the boundaries of which are composed of narrow bands of tangled dislocations. There is, as a consequence, a small random misorientation of 1 to 2° between the cells. The cells may develop...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005459
EISBN: 978-1-62708-196-2
... the incompatibility of deformation between neighboring grains is accommodated. In this case, the strain and flow stress are local, microscopic values. All mechanisms that govern recrystallization (dislocation generation, recovery, nucleation, grain-boundary migration) as well as the precipitation of secondary...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009002
EISBN: 978-1-62708-185-6
... of dislocations than in materials whose deformation is controlled by dynamic recovery. Furthermore, as the temperature is increased, the mobility of grain boundaries increases rapidly. Differences in dislocation density across the grain boundaries, coupled with high mobility, lead to the nucleation and growth...