Recrystallisation of channel die deformed single crystals of typical rolling orientations

Godfrey, A.; Jensen, D. Juul; Hansen, Niels

doi:10.1016/s1359-6454(01)00148-3

Cited by 73 publications

(38 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A clear example of this high sensitivity to local variations in the deformation microstructure can be seen in the recrystallization behaviour of aluminium single crystals of {112}111 ("Copper") and {123}634 ("S") orientations deformed to a strain of  = 1.5 by channel-die compression. For both crystals the average misorientation angles and spacings of the dislocation boundaries in the deformed microstructure, and hence the stored energy of deformation, are very similar [24], but for the Copper orientation crystal recrystallization starts at a temperature of 200°C after just 2 minutes, whereas for the S orientation crystal recrystallization is only observed at a temperature of 300°C after 30 minutes of annealing [25].…”

Section: Introductionmentioning

confidence: 93%

Characterization and influence of deformation microstructure heterogeneity on recrystallization

Godfrey

Mishin

2015

IOP Conf. Ser.: Mater. Sci. Eng.

Self Cite

View full text Add to dashboard Cite

Abstract. The microstructure resulting from plastic deformation of metals typically contains heterogeneity on several length scales. This is also true for samples deformed to large strains, where an important form of heterogeneity is in the variation in microstructural refinement by high angle boundaries. A methodology for quantifying this type of heterogeneity based on the identification of areas classified as low misorientation regions (LMRs) is described, and some parameters for quantification of both the extent and length scale of LMRs are presented. It is then shown how this approach can be used to investigate the early stages of recrystallization in samples deformed to large strains, by direct comparison of electron backscatter diffraction (EBSD) maps of the same area before and after annealing. Methods for estimation of the stored energy of deformation from EBSD data are also surveyed and the problems of each for quantification of the local variation in stored energy are discussed, where it is concluded that a method based on the summation of the contributions from individual boundary segments is considered to be the best suited at present for characterization of the local variation in stored energy on the scale of the dislocation boundary features.

show abstract

Section: Introductionmentioning

confidence: 93%

Characterization and influence of deformation microstructure heterogeneity on recrystallization

Godfrey

Mishin

2015

IOP Conf. Ser.: Mater. Sci. Eng.

Self Cite

View full text Add to dashboard Cite

show abstract

“…A spectrum of deformation microstructure is produced by deforming single crystals with different starting orientations, e.g., (Gottler 1973;Kawasaki 1979;Kawasaki and Takeuchi 1980;Malin et al 1981;Becker et al 199 1;Blicharski, Becker and Hu 1993;Driver, Juul Jensen andHansen 1994, Godfrey, Juul Jensen andHansen 1998b). These various structures affect the subsequent recrystallization, e.g., (Driver 1995;Godfrey, Juul Jensen and Hafien 1995;Ferry and Humphreys 1995;Huang, Humphreys and Ferry 2000;Godfrey, Juul Jensen and Hansen 2000); see also articles by the same authors in these proceedings. The level of heterogeneity may be high, especially in the layered structures developed in crystals whose nominal deformed orientations differs substantially from its initial orientation.…”

Section: )mentioning

confidence: 99%

Deformation microstructures and selected examples of their recrystallization

Hughes

2001

Surface & Interface Analysis

View full text Add to dashboard Cite

The elements that are needed to describe a deformation structure—grains, grain boundaries, macroscale banding within crystals, cell blocks, geometrically necessary boundaries and incidental dislocation boundaries (cell boundaries)—are presented and described for fcc metals and alloys of medium to high stacking fault energy. Pertinent to this quantitative description are the local orientations, structural morphology, different boundary misorientations and spacings as a function of strain and deformation conditions. Three specific examples are given in which particular aspects of the deformation structure are shown to direct the recrystallization behavior. Copyright © 2001 John Wiley & Sons, Ltd; first published by Risø National Laboratory.

show abstract

“…The high angle interface generated within grain O near the N/O boundary (figure 5) is also a potential site for recrystallization. Juul Jensen et al [41], Hansen et al [42] and Godfrey et al [43] reported the early growth of subgrains at irregular boundary interfaces and concluded that local variations in texture (orientation) and microstructure (stored energy) play a major role in recrystallization.…”

Section: Uncovering Highly Misoriented Fragments At Hotband Grain Boumentioning

confidence: 99%

Uncovering the true nature of deformation microstructures using 3D analysis methods

Ferry

Quadir

Afrin

et al. 2015

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

Abstract. Three-dimensional electron backscatter diffraction (3D EBSD) has emerged as a powerful technique for generating 3D crystallographic information in reasonably large volumes of a microstructure. The technique uses a focused ion beam (FIB) as a high precision serial sectioning device for generating consecutive ion milled surfaces of a material, with each milled surface subsequently mapped by EBSD. The successive EBSD maps are combined using a suitable post-processing method to generate a crystallographic volume of the microstructure. The first part of this paper shows the usefulness of 3D EBSD for understanding the origin of various structural features associated with the plastic deformation of metals. The second part describes a new method for automatically identifying the various types of low and high angle boundaries found in deformed and annealed metals, particularly those associated with grains exhibiting subtle and gradual variations in orientation. We have adapted a 2D image segmentation technique, fast multiscale clustering, to 3D EBSD data using a novel variance function to accommodate quaternion data. This adaptation is capable of segmenting based on subtle and gradual variation as well as on sharp boundaries within the data. We demonstrate the excellent capabilities of this technique with application to 3D EBSD data sets generated from a range of cold rolled and annealed metals described in the paper.

show abstract

Recrystallisation of channel die deformed single crystals of typical rolling orientations

Cited by 73 publications

References 19 publications

Characterization and influence of deformation microstructure heterogeneity on recrystallization

Characterization and influence of deformation microstructure heterogeneity on recrystallization

Deformation microstructures and selected examples of their recrystallization

Uncovering the true nature of deformation microstructures using 3D analysis methods

Contact Info

Product

Resources

About