Shozo Yoshioka1, Mitsuo Mera1 and Kenji Morii2
1College of Engineering, University of Osaka Prefecture, Sakai
The deformation behavior and the orientation change during rolling of the single crystals of Cu-10 wt%Zn (Ms-10) and Cu-30 wt%Zn (Ms-30) alloys which have initially the (513)[
(1) In the Ms-10 crystal and the Ms-30 crystal that did not accompany twinning deformation upon rolling (whether or not Ms-30 crystals accompanies twinning deformation upon rolling, depends on the initial orientations), the lattice rotation about the rolling direction occurred, giving rise to the (101)[ 21] orientation. This change of orientation is explained well in terms of the slip deformation in the (513)[ 21] crystal during rolling. It is considered that the lower stability about the rolling direction of the (513)[ 21] orientation in α -brass may be related to the dynamic recovery during deformation being depressed with the decrease in stacking fault energy due to alloying effect.
(2) In the Ms-30 crystal that caused twinning upon rolling, the (111)[ 10]+(111)[1 0] orientations were attained accompanying the formation of the banded regions of inhomogeneous deformation (shear bands) and retained up to high reductions. Such change of orientation and the stabilization of this orientation are understood in view of the operation of the shear bands during rolling of the (513)[ 21] crystal containing twin lamellae. According to transmission electron microscopy of the rolled Ms-30 crystal, it was revealed that the microstructures inside the shear bands consist of fine-crystalline aggregates.
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