M. Wrobel et al., The effect of deformation on texture, microstructure and recrystallizationof a cross-rolled Cu-5 wt% Al alloy, ARCH METALL, 44(2), 1999, pp. 203-220
Polycrystalline Cu-5 wt %Al alloy was rolled initially to 30% deformation a
nd 60% deformation and then additionally rolled after switching the rolling
direction with the transverse direction to deformations: 10-80%. Examinati
ons of the textures and microstructures after deformation and subsequent re
crystallization were performed.
It was found that the change in the direction of plastic flow alone is not
sufficient for localization of the plastic deformation in the form of shear
bands; also, the application of a large amount of deformation is required.
The shear bands constitute the basic feature of microstructure in samples
subjected to cross-rolling with the total true deformation greater then 0.9
. Shear bands are the places where recrystallization commences and proceeds
relatively fast. Regions between shear bands recrystallized at higher temp
eratures, however, the recrystallization proceeds slower and progress by th
e growth of grains from the former shear bands. The grain size after recrys
tallization is not uniform. Finer grains appear within former shear bands.
The deformations imposed after change in the rolling direction slowly chang
es the alloy-type texture formed during initial rolling. After the 80% redu
ction in thickness by the secondary rolling the texture being formed during
the initial rolling is rotated around the normal direction by 90 degrees.
The recrystallization texture for that material (with a high density of she
ar bands) contain components which can be derived from the components of th
e deformation texture by their rotation around the common [111] poles by an
gles about 40-50 degrees.