Microstructure and Texture Evolution During Annealing of Plane Strain Compressed Al and Al-1%Mn Alloy Single Crystals

摘要

The microstructure and the texture evolutions of partly recrystallized samples of pure Al and the Al-1%wt. Mn alloy have been characterized by a high resolution SEM/EBSD. The single crystals of the Goss{110}001 and brass{110}112 orientations, stable in the plane strain compression, were deformed in a channel-die up to 60% to develop a homogeneous structure composed of two sets of symmetrical primary microbands and then shortly annealed. It is documented that the orientations of the initial nucleus were scattered but not accidental. The disorientation axes in the orientation relationship across the recrystallization front usually coincide with one of the 112, 221, 102 or 111 crystallographic directions and were rather rarely close to the 110 or 001 directions. The disorientation axis of the 111- type is only one of the few most often observed.