Texture and anisotropy in the Al–Mg alloy AA 5005 – Part I: Texture evolution during rolling and recrystallization

Control of the plastic anisotropy during forming of a metallic sheet requires detailed knowledge about its microstructure and, especially, its crystallographic texture. In the present study the correlation of texture and anisotropy is studied in sheets of the Al–Mg alloy AA 5005. A series of different material states with different textures was produced by back-annealing of cold rolled sheet in the H18 state to the fully soft O condition and, secondly, by subsequent cold rolling from the soft (O) to the fully hard H19 state. present 1st part of this study the evolution of microstructure and texture in AA 5005 is discussed. Back-annealing of rolled sheet was characterized by recovery followed by recrystallization. These softening reactions were simulated with an analytical model named AlSoft, which was able to reproduce the decline in yield strength and the changes in microstructure and texture. Upon subsequent cold rolling the recrystallization texture in the soft material was gradually transformed back into the typical rolling texture orientations. This behaviour, both the sharpening of the rolling texture and the decay of the recrystallization texture from the soft-annealed state, was simulated with the GIA polycrystal-plasticity code. rrelation of the various textures with anisotropic sheet properties, including Young׳s modulus, yield strength and r-values in uniaxial tensile tests as well as earing upon cup drawing, will be presented in part II of this study.