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MM: Fachverband Metall- und Materialphysik

MM 29: Topical Session Bulk Nanostrucured Materials VI - Mechanical Properties I

MM 29.1: Topical Talk

Mittwoch, 28. März 2012, 10:15–10:45, H 0107

Texture, microstructure and mechanical properties of ARB aluminium laminates — •Werner Skrotzki — Institut für Strukturphysik, Technische Universität Dresden, D-01062 Dresden, Germany

Aluminium sheets with layers of different purity (A: 99.999 and B: 99.5) produced by accumulative roll bonding (ARB) were studied for different numbers of ARB cycles. Both material layers show a contrasting dynamic recrystallization behaviour with A and B recrystallizing discontinuously and continuously, respectively. The layered structure is stable up to 6 cycles, for higher cycles slightly necking starts. Global textures were measured by neutron diffraction while local textures of the different layers were measured by X-ray as well as electron backscatter diffraction (EBSD). The microstructure is analyzed from EBSD mappings. The mechanism of texture and microstructure development will be discussed in detail through thickness and with the number of ARB cycles. The strength and Lankford parameter were measured by tensile testing. ARB increases the tensile strength significantly. The planar anisotropy decreases with the number of ARB cycles while the normal anisotropy reaches a plateau after 2 cycles. The results will be compared with simulations on the plastic anisotropy of laminated structures.