CHARACTERIZATION OF LOCAL TEXTURE IN A MODERATELY DEFORMED POLYCRYSTALLINE ALSI-ALLOY

Polycrystalline material of various grain sizes of AlSi-alloy containing second-phase particles have been deformed at room temperature in axisymmetric compression. The variation in crystallographic orientation in the as-deformed material was obtained by the Electron Back Scattered Pattern (EBSP) technique in SEM. ''Random'' and cumulative long range misorientation gradients have been quantified within the matrix (M) and at heterogeneities such as the grain boundary (GB), the triple line region (TL) and in the vicinity of large second phase particles (P) in material compressed to equivalent plastic strains of 0.2 and 0.4. It is shown that the misorientation gradient increases differently in different regions with increasing strain. Maximum values were found in regions expected to be more strained than average in order to accommodate imposed constraint From neighbouring grains or from the presence of large second phase particles. An important feature of the deformed structure seems to be the cumulative rotation of the lattice about an axis close to the [111]-axis in regions with large misorientations.