The Study of Deformation Substructure in Coarse Grained Aluminium due to Tension

Abstract

The substructure formed in coarse grained aluminium subjected to tensile deformation was investigated by X-ray diffraction microscopy. The relations of the revealed substructure to the reflection lattice plane, and to the depth from the surface of the grain, were also studied.
The results are summarized as follows;
(1) Formation of substructure in a specimen with relatively coarse grains having similar property like a single crystal is connected with the orientation of crystal grains. When the tension axis of the crystal grain is near its [110] zone axis, substructure is formed in parallel with both the slip line and the deformation band. On the other hand, when it is near the [100] zone axis, the substructure formed is parallel only to the deformation band.
(2) In a specimen with relatively fine polycrystalline grains, block-like substructure is formed independently of the orientation of grains and reflection lattice plane.
(3) The substructure is various in size in proportion to the depth from the surface.
(4) The total misorientation within a grain increases with increasing deformation, which does not seem to have anything to do with the reflection lattice plane, the original grain size or the orientation of the grain.