日本金属学会誌

J. Japan Inst. Metals, Vol. 39, No. 4 (1975),
pp. 394-402

Rolling Deformation of the (513)[121] Single Crystals of α -Brass

Shozo Yoshioka1, Mitsuo Mera1 and Kenji Morii2

1College of Engineering, University of Osaka Prefecture, Sakai
2Graduate School, University of Osaka Prefecture, Sakai

Abstract:

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)[121] orientation and the orientations near to it have been studied by means of optical microscopy and reflection electron diffraction technique. It was clarified that the (513)[121] orientation which is stable during rolling of the pure copper single crystal was less stable in the case of rolling of α -brass single crystals, and this would be due to the effect of alloying. The results are summarized as follows:
(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)[121] orientation. This change of orientation is explained well in terms of the slip deformation in the (513)[121] crystal during rolling. It is considered that the lower stability about the rolling direction of the (513)[121] 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)[110]+(111)[1 10] 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)[121] 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.


(Received 1974/10/21)

Keywords:


PDF(Free)PDF (Free)     Table of ContentsTable of Contents

Please do not copy without permission.