Influence of external constraint and rolling geometry on deformation banding of copper single crystals with 123<634> orientation

In order to further understand the similarity and difference between deformation mechanisms of single crystals and polycrystalline materials, the influence of external constraint and rolling geometry on the deformation behaviour of copper single crystals with 123<634> orientation was investigated by embedding them into metal frames of different strengths. The metal frames were made of aluminum and mild steel, respectively. The results show that the deformation banding degree of the crystal increases with the strength of metal frame and shear strain. For the crystals rolled under lower γ_g (γ_g is the ratio of the geometrical redundant shear strain to the normal rolling strain), the deformation is homogeneous. For the crystals rolled under higher γ_g, the deformation is extremely inhomogeneous. The deformation is more homogeneous in the crystals rolled in steel frames than that rolled in aluminum frames. The S-orientation is more stable in the crystals rolled under lower γ_g than that rolled under higher γ_g.