Overview no. 76: Mechanism of deformation and development of rolling textures in polycrystalline f.c.c. metals—I. Description of rolling texture development in homogeneous CuZn alloys

Abstract

The texture development of cold rolled copper and α brass (2.5, 5, 10, 30%Zn) is investigated as a function of rolling reduction in great detail. For this purpose the three-dimensional orientation distribution functions (ODFs) were determined by X-ray diffraction and analysed and ghost-corrected with the help of Gauss model calculations. The resulting large volume of experimental data allowed thorough testing of the different methods of describing the rolling textures. At low degrees of rolling the textures of all investigated alloys are very similar and can best be described by orientation concentrations along two fibres, the “α fibre” (〈110t $ ̆ parallel to sheet normal) and the “β fibre” (〈110〉 tilted 60 towards rolling direction, usually called “skeleton line”). With increasing degree of rolling, this fibre structure deteriorates and along the fibres which were originally homogeneously occupied, pronounced maxima form, the orientation of the β skeleton line shifts and maxima develop away from the fibre. These structures are characterized by strong peaks and can be described rather well by components with Gauss-type scattering. By plotting the volume fractions of these components as a function of the degree of rolling the texture development and particularly the transition from the copper to the brass type rolling texture can be quantitatively discussed for the different Zn concentrations, i.e. for different stacking fault energies. This leads to conclusions about the underlying mechanisms of deformation.