Correspondence between Layered Cell Structures and Slip Lines in Deformed Copper Single Crystals

Abstract

Layered cell structures in deformed copper single crystals with the [112] and the [415] tensile axes were observed by transmission electron microscopy on slices with (1̄1̄1), (11̄0), and (001). It was confirmed that cell walls are formed on planes rotated around the <112> axis on the active slip plane to a definite direction with respect to the tensile axis. The rotation angles were measured as a function of tensile stress. The slip line lengths on the two side planes were measured by optical microscopy. The slip line lengths and the ratios of the slip line lengths of edge dislocations to those of screw dislocations agree approximately with the slip distances estimated from the spacing and the rotation angle of the cell walls, assuming that the cell walls of the primary system are obstacles for primary dislocations. It is concluded that the slip line length is mainly determined by the layered cell structure.

Deformation banding and shear banding in single crystals

“…Slip systems s ∈ S are not in accord with this mechanism and are therefore excluded from the computation ofΓ p . To validate the above phenomenological assumption, Table 1 lists the computedΓ p * /Γ p * * under uniaxial tension in eight copper single crystals studied experimentally by Kawasaki and co-workers [48,49,50] assuming…”

Deformation microstructures and selected examples of their recrystallization

“…NonlaYered structures and decreasing levels of heterogeneity. 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.…”

Modelling the nucleation and growth of fragment boundary segments in terms of disclinations

“…The mobile dislocation density has been used as a constant fitting parameter with ρ m = 10 14 /m 2 . Experimentally, stage III of work-hardening is found to start at equivalent strains of about 0.11 [14,15]. The simulation predicts the onset of disclination production, i.e.…”

“…Second, it has a large difference between the resolved shear stresses on the primary and on the cross-slip plane. Third, it has been studied in many experiments before [14][15][16]. The mobile dislocation density has been used as a constant fitting parameter with ρ m = 10 14 /m 2 .…”