Texture Analysis with 3MA-Techniques

Abstract

Texture is generated by rolling and heat-treatment processes during the production of sheets. After such processes (hot and cold rolling, recrystallization), the crystal orientations are not equally distributed in the alloy. Consequently elastic and magnetic properties of the sheets are anisotropic. There is a correlation between elastic and plastic anisotropy. Accordingly, the usually applied techniques to determine the texture are different: for instance, differences in plastic deformation can be detected by the determination of the average Lankford plastic strain ratio r_m, elastic anisotropy by the determination of the Young’s modulus and x-ray texture analysis. In addition to the x-ray measurements, ultrasonic and magnetic techniques offer the possibility for fast and relatively simple analysis of texture. The x-ray measurements, which can be applied under practical conditions as well, are the state of technology¹. The measurement of ultrasonic velocities in different directions is an alternative approach to the x-ray measurement and is being developed for practical applications². The elastic anisotropy will be determined by the crystal texture, whereas the plastic anisotropy by the microstructural parameters like dislocation density and grain boundaries. Since the same microstructural features restrict the mobility of Bloch-walls, magnetic techniques offer the possibility to analyze the plastic anisotropy.