EXPERIMENTAL-DETERMINATION OF PLASTIC SPIN IN POLYCRYSTALLINE MATERIALS

Plastic deformation of polycrystalline materials is accompanied by cry stal lattice rotations which lead to texture changes. Part of these ch anges can be represented by the rotation of a common reference system formed by the symmetry elements of the texture function. The symmetry elements can be found with an accuracy of similar to 0.5 degrees using an autocorrelation function of the orientation distribution function (ODF). This part of the texture change is related to plastic spin. A s econd part of the texture changes can be expressed by an intercorrelat ion parameter (similarity degree) of the two textures observed before and after deformation, respectively. Using this method, the texture ch anges after 20% elongation in different directions to the rolling dire ction of a recrystallized aluminium sheet were studied. (C) 1997 Elsev ier Science Ltd.