Inhomogeneous Warm Rolling and Annealing of AA3104: Shear Texture Development and Thermal Stability

Two types of commercial AA3104 hot band - fully and partially recrystallized - have been warm rolled at 200 deg C to achieve high friction between the rolls and the material. Subsequently the samples underwent an annealing treatment. X-ray textures have been measured for each processing step at 6 different thickness levels. Starting from the two different initial hot band textures both materials revealed the development of a strong through thickness texture gradient. In the centre of the sheet a common plane strain beta -fibre texture evolved. Between s = 0.4 and s = 0.6 the texture type changed significantly to a typical fcc shear texture being strongest at the surface. The observed difference in shear texture intensity for the two materials led to the conclusion, that stronger initial beta -fibre components cause weaker shear textures. This was analysed by simulations. The annealing textures at the surface revealed a degradation of almost all texture components except of the {111} < 112 > orientation on the gamma -fibre and removed the textural difference of the two materials.