Tensile Deformation and Recrystallization in Copper Single Crystal and Bicrystal with Schmid Factor of 0.5

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  • Okada Tatsuya
    Department of Mechanical Engineering, Faculty of Engineering, The University of Tokushima
  • Kinoshita Hiroshi
    Department of Mechanical Engineering, Faculty of Engineering, The University of Tokushima
  • Tagami Minoru
    Department of Mechanical Engineering, Faculty of Engineering, The University of Tokushima
  • Inoko Fukuji
    Department of Mechanical Engineering, Faculty of Engineering, The University of Tokushima

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説明

In order to study the kind band (KB) formation and its effect on recrystallization in copper, single crystals and an asymmetric bicrystal in which the primary slip system had a Schmid factor of 0.5, were deformed in tension and subsequently annealed. Several indents were made on the surface of one of the single crystals to promote KB formation. In kink bands (KBs), slip systems on the critical slip plane were activated, which induced the rotation of KBs in the direction opposite to that of the deformation matrix (DM). The orientation difference between the DM and KB reached 20° to 25° at a nominal tensile strain of 0.4. The KBs in the bicrystal were about ten times broader than those in the single crystals. After annealing, recrystallized grains having twin-relationships one another formed in the bicrystal and the single crystal with indents. A comparison was made with aluminum single crystals and bicrystals of the same orientation.

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