Deformation and Recrystallization of Aluminum Bicrystals Having Asymmetric Tilt Grain Boundary

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  • Okada Tatsuya
    Department of Mechanical Engineering, Faculty of Engineering, Tokushima University
  • Kotaka Masashi
    Department of Mechanical Engineering, Faculty of Engineering, Tokushima University
  • Wada Tetsuya
    Department of Mechanical Engineering, Faculty of Engineering, Tokushima University
  • Tagami Minoru
    Department of Mechanical Engineering, Faculty of Engineering, Tokushima University
  • Inoko Fukuji
    Department of Mechanical Engineering, Faculty of Engineering, Tokushima University

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Two types of aluminum bicrystals (Bicrystal 1 and 2) having an asymmetric tilt grain boundary were grown. In Bicrystal 1, the orientations of component grains were related to each other by 45° rotation about the normal of the wide surface of the tensile specimen. In Bicrystal 2, although the primary slip planes were symmetric about the grain boundary plane, the component grains were related to each other by 180° rotation about the tensile axis of the specimen. The specimens were deformed to a tensile strain of 0.3 and subsequently annealed. In both bicrystals, deformation bands were not formed symmetrically about the grain boundary. After annealing, no strain induced boundary migration was found. Recrystallization occurred through ⟨111⟩ rotation mechanism. These results were compared with the deformation and recrystallization in aluminum bicrystals having a symmetric tilt grain boundary.

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