Role of stored energy in static recrystallization of cold rolled copper single and multicrystals

Mahmoud, Gouda M.; Bacroix, Brigitte

doi:10.1016/s1359-6454(00)00155-5

Cited by 58 publications

(26 citation statements)

References 33 publications

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“…Budd and Jacka, 1989, Figure 8]. This value of k is similar to suggested values for a mix of screw and edge dislocations, k = 0.1 [Mohamed and Bacroix, 2000]. There is also considerable uncertainty about the orientation of newly recrystallized grains.…”

Section: Discussionsupporting

confidence: 80%

“…The approach taken here is to parameterize this process by considering the energies involved. However, even the energy associated with a dislocation density r is difficult to estimate [Mohamed and Bacroix, 2000;Kuhlmann-Wilsdorf, 1998]. The resulting fabric and strain rate (Figure 6 using equation (19) with k = 0.35) are very similar to laboratory measurements [cf.…”

Section: Discussionmentioning

confidence: 55%

“…where G is the shear modulus, b is the length of the Burgers vector, k is (4p) À1 for screw and [4p(1 -n)] À1 for edge dislocations (where n ' 0.3 is the Poisson's ratio), and R e is the mean average of the dislocation strain field range [Mohamed and Bacroix, 2000;Kuhlmann-Wilsdorf, 1998. R e is commonly approximated by 1 ffiffi ffi r p , but Mohamed and Bacroix [2000] found that this leads to an underestimate of E disl ; k is therefore treated as an adjustable parameter, but R e is kept as R e ¼ 1 ffiffi ffi r p .…”

Section: Dynamic Recrystallizationmentioning

confidence: 99%

“…R e is commonly approximated by 1 ffiffi ffi r p , but Mohamed and Bacroix [2000] found that this leads to an underestimate of E disl ; k is therefore treated as an adjustable parameter, but R e is kept as R e ¼ 1 ffiffi ffi r p . For ice, G ' 3.4 Â 10 9 Pa and b = 4.5 Â 10 À10 m.…”

Section: Dynamic Recrystallizationmentioning

confidence: 99%

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Fabric development with nearest‐neighbor interaction and dynamic recrystallization

Þorsteinsson

2002

J. Geophys. Res.

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[1] Polycrystals undergoing ductile deformation develop lattice-preferred orientation (fabric) as a result of intracrystalline slip. A consequence of fabric development is that bulk physical properties become anisotropic. Fabric development and macroscopic deformation are studied by examining three effects: nearest-neighbor interaction (NNI) among crystals, polygonization, and migration recrystallization. The effects of NNI are modeled by arranging the crystals on a three-dimensional cubic grid and assigning six neighbors to each crystal. The ''strength'' of interaction can vary from no interaction (homogeneous stress) to ''strong'' interaction (significant stress redistribution). Increasing the NNI leads to a more homogeneous strain. Fabric varies in both strength and symmetry at a given bulk strain, depending on the strength of NNI. For a prescribed fabric the strain rate increases as the NNI increases. Recrystallization is modeled from energy balance considerations, and polygonization is formulated in terms of stress differences. Both processes require knowledge of dislocation density, which is calculated in the model as a function of crystal strain and grain size, both of which vary with time. Models of fabric development in ice that include NNI lead to more realistic fabric evolution than models with homogeneous stress. However, available data on fabric evolution are inadequate to determine quantitatively the strength of NNI acting in ice.

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Section: Discussionsupporting

confidence: 80%

Section: Discussionmentioning

confidence: 55%

Section: Dynamic Recrystallizationmentioning

confidence: 99%

Section: Dynamic Recrystallizationmentioning

confidence: 99%

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Fabric development with nearest‐neighbor interaction and dynamic recrystallization

Þorsteinsson

2002

J. Geophys. Res.

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“…A stored energy of 102 J/mol was attained for CT-rolled Cu, about 2.5 times that for the same Cu rolled at RT. According to Mohamed et al,32) the stored energy in pure Cu can be linearly related to the dislocation density by…”

Section: Evolution Towards Nanostructures Upon Prolongedmentioning

confidence: 99%

Dynamic Processes for Nanostructure Development in Cu after Severe Cryogenic Rolling Deformation

Wang

Jiao

2003

Mater. Trans.

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The dynamic grain refinement behavior upon severe plastic deformation has been systematically studied in commercial purity copper that was heavily cold rolled to large deformations at cryogenic temperatures. The low-temperature rolling allows the accumulation of extraordinarily high densities of dislocations in Cu, enabling an investigation of the various dynamic recrystallization phenomena upon further deformation. The eventual steady-state grain sizes achieved, as well as the dynamic recrystallization mechanisms, are studied using controlled deformation tests combined with transmission electron microscopy. The dominant mechanisms observed to contribute to grain refinement in Cu include the classical migration dynamic recrystallization process, the deformation twinning, as well as the continuous dynamic recrystallization via progressive lattice rotation upon deformation to extremely large strains. The strain rate and deformation temperature have strong effects on the operative mechanisms and the grain sizes achieved in the ultrafine and nanocrystalline regimes.

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The Effect of Dislocation Contrast on X-Ray Line Profiles in Untextured Polycrystals

Ungár

Tichy

1999

phys. stat. sol. (a)

394

193

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Role of stored energy in static recrystallization of cold rolled copper single and multicrystals

Cited by 58 publications

References 33 publications

Fabric development with nearest‐neighbor interaction and dynamic recrystallization

Fabric development with nearest‐neighbor interaction and dynamic recrystallization

Dynamic Processes for Nanostructure Development in Cu after Severe Cryogenic Rolling Deformation

The Effect of Dislocation Contrast on X-Ray Line Profiles in Untextured Polycrystals

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