Deformation and recrystallization textures of surface layer of copper sheet

Abstract

The texture of the surface layer of a 93% cold rolled copper sheet was approximated by {001}〈110〉, which changed to a new texture which may be approximated by {034}〈100〉 on recrystallization. The shear texture {001}〈110〉 was calculated to be stable at dε 12/dε 11 = √2 where subscripts 1 and 2 indicate the rolling direction and the sheet normal direction, respectively. The shear texture and related recrystallization texture did not have a common 〈111〉 relationship, which is usually regarded as a token of the oriented growth theory for recrystallization. The {034}〈100〉 orientation did not exist as a stable orientation under the condition of the shear texture being stable, which does not seem to support the oriented nucleation theory. The measured texture orientation, {034}〈100〉, is very close to the {01√2}〈100〉 orientation which is predicted by the maximum energy release theory in which the absolute maximum normal stress direction in the deformed matrix becomes parallel to the minimum elastic modulus direction of recrystallized grains.