α-黄銅の圧延における変形様式

概要

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Several fcc metals and alloys with low stacking fault energy have been rolled to various reductions. Detailed metallographic examination of the deformation structure has been carried out. The results for single crystals and polycrystals of α-brass are presented as the typical ones. The (211) [1^-11] crystals are deformed with peculiar deformation behavior such as shear banding after onset of mechanical twinning, while the (101) [1^^-21] crystals are deformed by normal slip. It is shown that a shear band is a plate-like region which is nearly perpendicular to the side surface, and inclined 30-40 deg to the rolling plane of the crystal. In polycrystals, nearly the same type of shear bands as in the single crystal is formed in the grains deformed by mechanical twinning. The shear bands contribute to the plastic deformation of the specimen, and could be approximated to a shearing system. The occurrence of shear bands may be explained on the basis of plastic instability or localized deformation. However, the activation of shear bands should be considered as one of the deformation modes inherent in rolling, and differentiated from the inhomogeneous deformation such as deformation banding.
1979-04-15