Macroscopic and microscopic subdivison of a cold–rolled aluminium single crystal of cubic orientation
- 8 October 1998
- journal article
- Published by The Royal Society in Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
- Vol. 454 (1978), 2555-2592
- https://doi.org/10.1098/rspa.1998.0271
Abstract
An aluminium single crystal of cube orientation has been rolled to 15, 30 and 50% reductions under controlled homogeneous rolling conditions. The deformation structure of the rolled specimens was investigated by both scanning electron microscopy (SEM) and transmission electron microscopy (TEM) over several scales of magnification. The local crystallographic orientations have been measured by an automatic electron back scattering patterns (EBSP) technique and a semiautomatic TEM method. Orientation image maps based on the local orientation data have been used to reveal the evolution of the deformation structure during rolling. It is observed that by an opposite rotation around transverse direction (TD) the crystal was subdivided into four macroscopic bands, termed matrix bands in the present paper, which are parallel to the rolling plane. Between the four bands there are three transition bands in which the orientation changes continuously from that of a matrix band to that of the adjoining one. A model based on the idea of location–dependent shear strain caused by geometric and friction effects together with a plasticity analysis has been used to explain the macroscopic subdivision of the crystal. In addition to the macroscopic subdivision, a microscopic subdivision by the formation of cell–blocks within the matrix bands and a cell structure within transition bands has also been observed. A difference related to shear amplitude difference between the active slip systems changing continuously across the crystal has been observed. Both the macroscopic orientation of the dislocation boundaries and the misorientation angles and axes across dislocation boundaries are analysed and it is found that Frank's formula is a useful tool in analysing the dislocation boundaries formed during deformation.Keywords
This publication has 36 references indexed in Scilit:
- Slip pattern, microstructure and local crystallography in an aluminium single crystal of copper orientation {112}〈111〉Acta Materialia, 1998
- Large strain deformation structures in aluminium crystals with rolling texture orientationsActa Metallurgica et Materialia, 1994
- Overview no. 96 evolution of f.c.c. deformation structures in polyslipActa Metallurgica et Materialia, 1992
- Orientation splitting of cube-oriented face-centred cubic crystals in plane strain compressionMaterials Science and Engineering: A, 1991
- Analysis of an aluminum single crystal with unstable initial orientation (001) [110] in channel die compressionMetallurgical Transactions A, 1991
- Channel die compression of aluminum single crystalsMaterials Science and Engineering: A, 1989
- Large strain work hardening and texturesProgress in Materials Science, 1980
- The structure of deformed aluminium and its recrystallization—investigations with transmission Kossel diffractionActa Metallurgica, 1977
- Textures of copper single crystals after rolling at room temperatureMaterials Science and Engineering, 1977
- The Mechanisms of Recrystallization in Cubic Metals with Particular Reference to Their Orientation-DependenceMetal Science, 1974