Rolling textures of polycrystalline aluminum having orientations three dimensionally controlled

Texture of rolled sheets of growth twinned aluminum (1st report)

Abstract

The crystallographic orientation of polycrystalline cast aluminum can be three-dimensionally controlled only by "regrowing" lamellar growth twin crystals from seed crystals. In this work, the aluminum cast blocks having six different orientations produced by this technique were rolled in order to determine the dependence of the rolling textures on the initial orientations.
The rolling textures of aluminum mainly depends upon the initial orientations. The transitions of initial orientations to the rolling textures during rolling are:
orientation texture
{110}<112> and{112}<110> →{110}<112>
{112}<111> →{112}<111>
{110}<111> →n{225}<353> or{112}<111>
{111}<112> →{157}<533>+{110}<225>
{111}<110> →{110}<335>+{135}<225>
{hkl}<100>columnar crystals →{110}<114>+{110}<001>
Equi-axed random crystals →n{146}<211>+{112}<111>
The orientations {110} <112> and {112} <111> are found to be stable in the rolling textures on the basis of experiments and analyses of slip systems. The orientation n {146} <121>, representing an intermediate orientation between {110} <112> and {112} <111>, is also found stable by experiments, but its little substantial evidence is given by analyses of slip systems.