Microstructure and Texture Evolution of Cold-Drawn 〈111〉 Single-Crystal Copper

Abstract

The evolution of microstructure and texture in drawn 〈111〉 single-crystal copper with strains from 0.28 to 4.12 was analyzed. The texture analysis shows that in drawn 〈111〉 single-crystal copper, grain subdivision takes place, and at high strains, fiber textures consist of 〈111〉 and 〈100〉. However, the distribution of fiber textures is inhomogeneous along the radial direction. 〈111〉 is located in the center of samples and 〈100〉 is near the surface. Comparison of the texture evolution of drawn 〈111〉 and 〈100〉 single-crystal coppers indicates that the initial orientation is an important factor affecting the ratio of fiber texture 〈111〉 to 〈100〉. The results of microstructure show that at strains lower than 0.28, microstructure can be characterized as dislocation cells and few microbands. When strains are more than 0.58, a large number of extended planar dislocation boundaries appear. At strains more than 1.96, most of the extended planar boundaries are parallel to the drawn direction.