Influence of Texture on a(sin2ψ) Curves Obtained From a Cold Rolled Nickel Sheet using Synchrotron Radiation

The Two-Axis Diffractometer at HASYLAB was used to measure a(sin2ψ) curvesby reflecting synchrotron radiation from five different lattice planes of a cold rollednickel sheet. We are especially interested in the complex surface state of thespecimen and investigated the sample as delivered without further polishing andetching. Strongly non-linear a(sin2ψ) curves were observed. Most of them vary in anon-linear way if external uniaxial stress is applied. In this paper we study theinfluence of texture using formalism based on the ODF, and evaluated for the Reussand the Voigt cases, respectively. Texture alone, however, is not sufficient to explainthe whole variety of the observed effects