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The crystallographic aspects of the shear band formation in high purity Al single crystals deformed in plain strain compression tests at 77 K have been studied in detail. The structure observations as well as local orientation measurements clearly indicated that initially {112}〈111〉-oriented Al single crystals are stable only in a global sense. It is shown that the loss of the stability of the crystal orientation occurs as early as the plastic deformation begins. As a result of the crystal rotation within the macroscopic shear bands, two opposite tendencies of the scattering of the initial matrix orientation towards (100)[011] and (110)[001], and formation of two nearly symmetrically situated sets of these bands can be observed. The activation of new, highly stressed co-planar slip systems, situated along the shear plane, is documented. In agreement with the observed tendency of rotation, a crystallographic approach to the shear band formation is proposed.

Local Orientation Changes and Shear Banding in {112} 〈111〉-Oriented Aluminium Single Crystals