Direct observation of orientation change by channel die compression of polycrystalline aluminum—Use of a split sample

Panchanadeeswaran, S.; Doherty, R.D.; Becker, Richard

doi:10.1016/1359-6454(95)00186-7

Cited by 74 publications

(35 citation statements)

References 22 publications

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“…This modelling work needs to be coupled to a better experimental understanding of how plastic deformation leads to the generation of mobile, high angle boundaries that are required for nucleation to occur. Recent work by Panchanadeeswaran et al [38] demonstrated that individual grains reorient during plastic deformation with appreciable scatter from the predictions of the Taylor model. Calculations with a finite element model using crystal plasticity confirmed the strong effect of neighboring grains on the behavior of each grain.…”

Section: Special Textures In Recrystallizationmentioning

confidence: 99%

“…Such studies are very time consuming and, at present, specific to a given alloy after a given deformation. What is critically needed is an improved method predicting the detailed microstructures of deformed metals at the appropriate length scale, within and between grains [37,38] for a wide range of deformation conditions. The methods of finite element modelling [39,40] do seem to be becoming, at least potentially, rather promising, though clearly much remains to be done in developing the method and applying it [38].…”

Section: Role Of the Deformed Microstructure On Recrystallizationmentioning

confidence: 99%

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Current issues in recrystallization: a review

Doherty¹,

Hughes²,

Humphreys³

et al. 1997

Materials Science and Engineering: A

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The current understanding of the fundamentals of recrystallization is summarized. This includes understanding the as-deformed state. Several aspects of recrystallization are described: nucleation and growth, the development of misorientation during deformation, continuous, dynamic, and geometric dynamic recrystallization, particle effects, and texture. This article is authored by the leading experts in these areas. The subjects are discussed individually and recommendations for further study are listed in the final section. © 1997 Elsevier Science S.A.

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Section: Special Textures In Recrystallizationmentioning

confidence: 99%

Section: Role Of the Deformed Microstructure On Recrystallizationmentioning

confidence: 99%

Current issues in recrystallization: a review

Doherty¹,

Hughes²,

Humphreys³

et al. 1997

Materials Science and Engineering: A

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2,034

623

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“…That is, during recrystallization, after the initial heavy deformation, many grains nucleated internally from misorientations developed during deformation. [21][22][23] As an outcome, a much finer recrystallized grain size was obtained (Figure 4(I)), but the grains were largely misoriented from the preferred k fiber ( Figure 5(II)). It was also found that the density of lower-angle grain boundaries (misoriented less than 15 deg) in the recrystallized structure was significantly higher, about 25 pct, compared to 2 pct found in a material with a random texture.…”

Section: Discussionmentioning

confidence: 94%

Thermomechanical Processing for Recovery of Desired $$ {\left\langle {001} \right\rangle } $$ Fiber Texture in Electric Motor Steels

Stojakovic

Doherty

Kalidindi

et al. 2008

Metall Mater Trans A

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A processing route has been developed for recovering the desired k fiber in iron-silicon electrical steel needed for superior magnetic properties in electric motor application. The k fiber texture is available in directionally solidified iron-silicon steel with the 001 h i columnar grains but was lost after heavy rolling and recrystallization required for motor laminations. Two steps of light rolling each followed by recrystallization were found to largely restore the desired fiber texture. This strengthening of the 001 h i fiber texture had been predicted on the basis of the straininduced boundary migration (SIBM) mechanism during recrystallization of lightly rolled steel from existing grains of near the ideal orientation, due to postulated low stored energies. Taylor and finite element models supported the idea of the low stored energy of the k fiber grains. The models also showed that the k fiber grains, though unstable during rolling, only rotated away from their initial orientations quite slowly.

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“…[5,6] It is also intuitive that understanding the accommodation of plastic deformation at the local scale has important bearing on fracture and other failure related properties of a number of brittle solids. The original experiments of Barrett and Levinson [7] and the more recent repetitions of these experiments by Pachanadeeswaran et al [8] and by our research group [9] have cast serious doubts on the veracity of the currently used crystal plasticity theory. These experiments suffered from one or more of the following disadvantages in critically evaluating the models and providing new physical insight that could be used to improve the existing models: 1) These experiments are extremely difficult and time-consuming, although they have improved with the introduction of modern techniques.…”

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confidence: 98%

How Do Polycrystalline Materials Deform Plastically?

Kalidindi¹,

Bhattacharyya

Doherty

2003

Advanced Materials

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Ever since Ewing and Rosenhain [1] reported, at the beginning of the 20th century, the observation of (slip) markings that were oriented differently in different domains (crystals) on polished surfaces of lightly deformed samples of polycrystalline metals, the problem has captured the attention of several researchers who have sought to explain the exact physics controlling this phenomenon. While it is intuitive that the different constituent crystals are likely to experience different patterns of slip activity because of the differences in their lattice orientation in the sample, there does not yet exist a comprehensive theory that is currently capable of predicting accurately the crystal-scale evolution of microstructure for a specified imposed deformation history on the polycrystal. Modern crystal plasticity theory, built on the pioneering work of Taylor [2] and presented in its current form through the work of Asaro and Needleman, [3] and Kalidindi et al., [4] has enjoyed a great deal of success in predicting macroscopic anisotropic stress±strain curves and the averaged texture evolution in a variety of deformation paths for single-phase cubic polycrystalline metals.More recently, the attention has been focused on evaluating the accuracy of crystal plasticity models for predicting the evolution of microstructural details at the crystal scale. This is extremely important in developing recrystallization models. [5,6] It is also intuitive that understanding the accommodation of plastic deformation at the local scale has important bearing on fracture and other failure related properties of a number of brittle solids. The original experiments of Barrett and Levinson [7] and the more recent repetitions of these experiments by Pachanadeeswaran et al. [8] and by our research group [9] have cast serious doubts on the veracity of the currently used crystal plasticity theory. These experiments suffered from one or more of the following disadvantages in critically evaluating the models and providing new physical insight that could be used to improve the existing models: 1) These experiments are extremely difficult and time-consuming, although they have improved with the introduction of modern techniques. The experiments of Barrett and Levinson used X-ray and etch-pit techniques to monitor changes in lattice orientation of individual crystals with imposed deformation, while Pachanadeeswaran et al. used back-scattered Kikuchi diffraction patterns with manual identification of the patterns. In our recent work, we were able to exploit the recent introduction of orientation imaging microscopy (OIM), [10,11] which incorporates fully automated (computerized) identification of the back-scattered Kikuchi diffraction patterns and an automated computation of the crystal lattice orientation. The OIM technique is generally employed in a scanning electron microscope (SEM), and typically has a spatial resolution of about 1 lm.2) Since the techniques for measuring crystal orientations are surface techniques, the experiments are usually c...

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Direct observation of orientation change by channel die compression of polycrystalline aluminum—Use of a split sample

Cited by 74 publications

References 22 publications

Current issues in recrystallization: a review

Current issues in recrystallization: a review

Thermomechanical Processing for Recovery of Desired $$ {\left\langle {001} \right\rangle } $$ Fiber Texture in Electric Motor Steels

How Do Polycrystalline Materials Deform Plastically?

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