The microstructures of polycrystalline Al-0.1 Mg after hot plane strain compression

The microstructures of Al-0.1 Mg polycrystals deformed in plane strain compression at temperatures of 20-400 degrees C have been investigated by electron backscatter diffraction. At all temperatures, the microstructures are characterized by two types of banded substructure, primary bands of aligned low angle boundaries whose alignment to the rolling plane is a function of strain and temperature, and secondary bands which develop into grain-scale shear bands with increasing strain. Several aspects of the deformation micro structures, including the orientation dependence of subgrain parameters and the inhomogeneity of the microstructure, differ from those of single crystals of similar orientation, and this it attributed to local grain interactions. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.