Inhomogeneous Distribution of Residual Deformation Effects in Textured Bcc Metals

Abstract

The distribution of residual deformation effects in textured metal sheets was studied by X-ray diffractometric methods using a position-sensitive detector (PSD). The elaborated procedure is based on the geometric principles of texture measurement, while the PSD technique allows to observe the profile of the X-ray line simultaneously with registering of its intensity. The proper treatment of experimental results gives values of line intensity, half-width and peak position of each angular position of the studied sample. By analogy with the texture pole figures (TPF), the half-width pole figures (WPF) and the peak position pole figures (PPF) were constructed. The obtained WPFs describe the distribution of deformation effects in the textured sample depending on grain orientation. The distinct correlation between TPF and WPF is demonstrated for rolled Nb and β-Zr: maxima of WPF fall to minima of TPF, while minima of WPF are located at maxima of TPF. The PPF exhibits a cross-wise distribution of elastic strains, providing the mutual equilibrium of extended and contracted regions. To explain this regularity, texture formation mechanisms and probable mutual misorientation of neighbouring grains were considered.