Nucleation of cube texture in aluminium

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Abstract
Abstract Microstructures and textures have been examined in four different commercially pure aluminium alloys after cold rolling and annealing. A correlation has been established between the density of cube sites in the cold rolled structure and the strength of the cube texture component in the rolling ingots. Examination of the alloys by transmission electron microscopy revealed the presence of a {102} 〈201〉 texture component, i.e. the cube texture twisted 26° around the transverse axis. The cube crystallites frequently occurred either in bands together with {102} 〈201〉 oriented subgrains or in the periphery of larger areas of {102} 〈201〉. The effect of an inhomogeneous hot rolling texture on the recrystallization texture after cold rolling and annealing has been investigated and no correlation between the high fraction of cube texture in the hot rolled material and the strength of the cube in the sheet could be detected. The effect of dynamic recovery during cold rolling on the recrystallization texture has been examined by rolling at boiling water temperature, room temperature, and liquid nitrogen temperature. The strength of the cube texture component increased and the R–component decreased with increasing rolling temperature. As to the effect of alloy composition, the general trend is that the strength of the cube texture component decreases with, increasing alloy content. MST/217