A new model for recrystallization of heavily cold-rolled aluminum using orientation-dependent stored energy

Rajmohan, N.; Szpunar, Jerzy A.

doi:10.1016/s1359-6454(00)00154-3

Cited by 39 publications

(33 citation statements)

References 27 publications

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“…For ice the girdle pattern obtained in Figure 6 is commonly observed [Budd and Jacka, 1989]. That clearly indicates that there is a preferred orientation for the newly formed grains, but whether it is due to oriented nucleation or oriented growth is uncertain [Branger et al, 2000;Rajmohan and Szpunar, 2000]. The modeled strain rate prior to 1% strain will look different from experimental data since there is no initial redistribution of stress or an elastic response.…”

Section: Discussionmentioning

confidence: 86%

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: Discussionmentioning

confidence: 86%

Fabric development with nearest‐neighbor interaction and dynamic recrystallization

Þorsteinsson

2002

J. Geophys. Res.

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“…The SEs in individual texture components have been determined for several cubic metals using various methods, including neutron diffraction measurements and high-resolution X-ray diffraction (XRD) analysis. [11][12][13][14] It has been shown that there is sometimes a large difference in SE between different texture components after deformation, that this difference generally controls the initiation of different nucleation mechanisms (i.e., intergranular nucleation or SIBM), and that the components associated with the highest values of SE are always preferentially consumed during recrystallization. Moreover, it is also well recognized that the growth of the nuclei may depend not only on the local SE difference but also on the characteristics of the boundaries (especially the misorientation between neighboring grains, which has an impact on boundary energy and mobility) surrounding the nuclei.…”

Section: Introductionmentioning

confidence: 99%

Texture Evolution and Associated Nucleation and Growth Mechanisms during Annealing of a Zr Alloy

Zhu

Bacroix

Chauveau

et al. 2009

Metall Mater Trans A

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The evolution of the crystallographic texture in a Zr-2Hf alloy has been followed during deformation, primary recrystallization, and subsequent normal grain growth. The rolling textures (from 50 to 90 pct strain) are constituted of two partial orientation fibers, D f = {hkil}h10 " 10i and R f = {hkil}h11 " 20i; along which the two main orientations are the socalled ''tilted'' {0001}h10 " 10i and tilted {0001}h11 " 20i texture components for which the {0001} poles are approximately 25 deg away from the specimen normal direction (ND). A decrease in the intensity of the D f fiber and a continuous increase in the intensity of the R f fiber take place during primary recrystallization and normal grain growth. An analysis of the neutron diffraction line profiles reveals a stored energy (SE) difference between the main orientations of these two texture fibers after deformation. These observations as well as some considerations about the possible active deformation systems and some partial observations of the nucleation and growth states allow us to propose possible mechanisms to explain the observed texture evolution.

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“…This can be done from the microtexture data [6,38,39] and from X-ray peak broadening. [61][62][63][64] Point-to-point misorientation (h) and cell size (d) can be readily estimated, at all deformation conditions and for different orientations, from EBSD data. The term h/d is expected [6,[38][39][40] to scale with stored energy.…”

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confidence: 99%

“…The term h/d is expected [6,[38][39][40] to scale with stored energy. From X-ray peak broadening, using the standard Stibitz's approach, [61,64] stored energy for different peaks can also be estimated. These energy values provide a driving pressure for recrystallization.…”

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confidence: 99%

“…[30] At lower deformation temperatures, stored energy or peak broadening differences are substantial. In this study, differences in h/d between cube and noncube were measured at all deformation conditions, while differences in driving pressure (DSE) were estimated (from X-ray diffraction using Stibitz's [61,64] formula) for the lowest working temperature. The former was then scaled with the latter, so that trends in DSE could be plotted (Figure 10(a)), as a function of working temperature.…”

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confidence: 99%

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Relative Stability of Deformed Cube in Warm and Hot Deformed AA6022: Possible Role of Strain-Induced Boundary Migration

Raveendra

Paranjape

Mishra

et al. 2009

Metall Mater Trans A

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A new model for recrystallization of heavily cold-rolled aluminum using orientation-dependent stored energy

Cited by 39 publications

References 27 publications

Fabric development with nearest‐neighbor interaction and dynamic recrystallization

Fabric development with nearest‐neighbor interaction and dynamic recrystallization

Texture Evolution and Associated Nucleation and Growth Mechanisms during Annealing of a Zr Alloy

Relative Stability of Deformed Cube in Warm and Hot Deformed AA6022: Possible Role of Strain-Induced Boundary Migration

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