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dislocation density

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Published: 01 December 2009
Fig. 3 Plot showing the overall changes in dislocation density, ρ tot , as a function of creep strain for pure iron at 600 °C. Dislocation densities are different within the cell interiors, ρ s , and along the cell walls, ρ. Source: Ref 3 More
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Published: 01 December 2009
Fig. 10 Simulation of (a) temperature and (b) dislocation density in a breakdown and three-stand tandem mill hot rolling line, using integrated simulation models RoseRoll, StrucSim, 4IVM, RoseTem, and RoseStat (for details see Ref 17 ) More
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Published: 01 December 2004
Fig. 18 The probability density functions of the incidental dislocation boundaries (IDBs) misorientation angles normalized by the average misorientation angle, for cold-rolled aluminum and nickel plus compression-deformed copper. Copper data from Ref 53 and AISI 304L data from Ref 7 More
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005432
EISBN: 978-1-62708-196-2
..., distributing nuclei of recrystallized grains, growing the recrystallized grains, and updating the dislocation density. The article concludes with information on the developments in CA simulations. cellular automaton model static recrystallization dynamic recrystallization microstructure dislocation...
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
... of dynamic microstructural variables, such as material composition, grain size, dislocation density, precipitate size, and morphology, that evolve during the course of deformation. Thus, the time-dependent behavior of the structure parameter is also dependent on the stress, temperature, and the current...
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Published: 01 December 2009
Fig. 6 Two-dimensional simulations of primary static recrystallization in a deformed aluminum polycrystal on the basis of crystal-plasticity finite-element data. The figure shows the change in both microtexture (upper images) and dislocation density (lower images), which was derived from More
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
...-temperature deformation during further heat treatment. In the initial fully annealed state ( Fig. 1a ), the dislocation density of the material is very low (ρ ≈ 0.01 μm/μm 3 ). Strain hardening makes it grow to 10 4 μm/μm 3 ( Fig. 1b ). Since it was formerly believed that metals lost their crystalline...
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Published: 01 December 2004
Fig. 8 Effect of annealing time and temperature on the microstructure of an Fe-3Si single crystal, cold rolled 80% in the (001)[110] orientation. (a) High density of dislocations and no well-defined cell structure is revealed in the as-rolled condition. (b) Annealed at 400 °C (750 °F) for 1280 More
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Published: 01 January 2005
Fig. 8 Effect of annealing time and temperature on the microstructure of an Fe-3Si single crystal, cold rolled 80% in the (001)[110] orientation. Thin-foil TEM specimens prepared parallel to the rolling plane. All at original magnification 17,200×. (a) High density of dislocations and no well More
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
... state variable such as a grain number, crystallographic orientation, or dislocation density/level of stored work. Areas formed by cells with an identical grain number or similar state variable(s) define the grains. A set of rules defines the conditions by which cells may switch, that is, may change...
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Published: 01 January 1990
Fig. 8 Transmission electron micrograph of martensite substructure and high dislocation density in ferrite in a 0.04C-1.5Mn steel intercritically annealed at 726 °C (1340 °F) and rapidly cooled. Source: Ref 9 More
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Published: 01 January 1996
Fig. 6 Transmission electron microscopy structures of 4140 steel tempered at 400 °C (750 °F) before (a) and after (b) cycling at Δε/2 = 2.5%. There has been a large reduction in dislocation density. Source: Ref 15 More
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Published: 01 December 2009
Fig. 18 Model predictions for slab rolling. (a) Strain rate (s −1 ). (b) Strain. (c) Recrystallized fraction. (d) Dislocation density during the first recrystallization cycle. Due to symmetry, only a quarter section of the slab is shown. Source: Ref 39 More
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Published: 01 January 2005
Fig. 5 Progress of dynamic recrystallization when the recrystallized grain size is much smaller than the original grain size. Symbols are defined in Fig. 2(b) . Shading of grains darkens with increasing dislocation density. In (e), the fourth stage of the cascade includes new grains More
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Published: 01 December 2009
Fig. 11 Strain dependence of the grain size D (solid lines) and the dislocation density ρ (broken lines) over the lifetime of a grain during steady-state discontinuous dynamic recrystallization. Data pertaining to 304 steel were used at 1050 °C and two strain rates ( Table 4 ). More
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
... is based on the assumption that dislocation accumulation is governed by only one state variable, namely, the total dislocation density. This leads to a differential equation, a so-called state function, for dislocation accumulation in which history variables such as strain and time only appear...
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Published: 01 August 2013
dislocation density). (a) 0, (b) 1, (c) 5, and (d) 10% strain More
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Published: 01 December 2004
Fig. 30 TEM microstructure of an AZ91D magnesium sample containing 43% solid fraction. (a) Primary α-magnesium phase with laths having different dislocation densities and corresponding SAD pattern. (b) Fine-grained eutectic with α-magnesium particles on the order of 1 μm. (c) Thin section More
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Published: 30 November 2018
Fig. 6 Schematic illustration of the microstructural evolution during cold rolling, including the strong increase in lattice dislocation density at small strains, the appearance of microshear bands aligned with the {100} planes and shear bands at moderate strains, and full subdivision More
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
... densities, but because pure metal crystals are very soft, this requires great care to reduce thermal and mechanical stresses during growth and subsequent handling. Most metal single crystals have dislocation densities of about 10 6 to 10 7 per square centimeter. These dislocations result from stresses...