Modification of textures and drawability values of sheets of aluminum alloys al 1050 and al-mg 5754 by means of asymmetric rolling

The r -value of aluminum sheets is low because of the texture obtained after conventional rolling and annealing processes. An increase of the <111>//ND component results in an increment of the r -value not only in bcc metals, but also in metals with fcc structure. However, the <III>//ND texture cannot be obtained in fcc metals by a conventional rolling and annealing process, but this orientation is one of the main components of the shear texture in fcc metals. Consequently, the introduction of shear deformation parallel to the rolling plane during the aluminum rolling procedure will result in an improvement of its drawability. In this study the texture as well as the (r) over bar and Deltar-values of sheets of Al 1050 and Al-Mg 5754 has been investigated after asymmetric rolling. The rolling process was performed with the rolls arranged in Such a way that one rotates a double velocity than the other one. A considerable increase of the <111>//ND component with respect to the texture of conventional rolling has been achieved, resulting in a significant increase of the (r) over bar -value, even though the Deltar-value is large. This texture can be retained by recovering annealing.