日本金属学会誌

J. Japan Inst. Met. Mater, Vol. 78, No. 1 (2014),
pp. 23-30

Changes in Microstructure due to Cold-Rolling on 1050 Aluminum -(2) Reduction Rate of up to 84%-

Atsushi Yamamoto, Hiroyuki Ohmori, Takuya Kajiura, Masaaki Tsukamoto and Daisuke Okai

Division of Materials Science and Chemistry, Graduate School of Engineering, University of Hyogo, Himeji 671-2201

Abstract:

Lattice rotations due to cold-rolling on polycrystalline commercial 1050 aluminum were investigated on individual grains with the same area observation technique using scanning electron microscope (SEM)-electron backscatter diffraction (EBSD) system. After annealing at 803 K for 3.6 ks, a specimen was cold-rolled up to 84% with multi-pass rolling at about 30% reduction for each pass. Electropolishing of the specimen surface and EBSD observation were carried out after each rolling. Lattice rotation towards the rolling direction occurred at the early stage of multi-pass rolling, while the rotation towards the opposite rolling direction also occurred at the latter stage. To-and-fro motion in rotation would be repeated during multi-pass rolling. The rotation would be interpreted with slip system analyses assuming that stresses due to rolling are applied along the rolling direction and the surface normal direction. Primary and conjugate slips operated in the grains initially having orientations in the cold-rolled pure metal texture, which caused splitting orientations into near rotated cube orientation and near {111} < 110> orientation. In the case of the grains initially having near cube orientations, rotations toward two or three directions occurred at the early stage of multi-pass rolling, which caused the lattice rotation toward the rotated cube orientations and caused the orientation splitting into the above mentioned two orientations at the latter stage. These orientations, however, would not be stable for further cold-rolling but split into other orientations belonging to the surface rolling texture through the to-and-fro motion. [doi:10.2320/jinstmet.J2013045]


(Received 2013/6/26)

Keywords:

cold-rolling, aluminum, scanning electron microscope-electron backscatter diffraction system, same area observation, lattice rotation, slip system


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