日本金属学会誌

J. Japan Inst. Metals, Vol. 76, No. 9 (2012),
pp. 528-534

Same Area EBSD Observation on Early Stage of Recovery and Recrystallization in A1050 Aluminum after Cold-Rolling

Takuya Kajiura, Masaaki Tsukamoto and Atsushi Yamamoto

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

Abstract:

Recrystallization and recovery behaviors in A1050 aluminum cold-rolled at a reduction of 50% have been observed by means of SEM (Scanning Electron Microscope)-EBSD (Electron Back Scatter Diffraction) in detail. Intermittent annealing at 623 K, ion-polishing and EBSD measurement were repeated and changes in the microstructures were observed on the same view field in a specimen during annealing up to 3.6 ks. Dislocation cells surrounded with low and high angle boundaries were induced by cold-rolling. Two types of recovery behaviors were observed. The main difference between them was whether recovered subgrains were partly surrounded with high angle boundaries or not. The high angle boundary migrated to form a recrystallized grain. When low angle boundaries were formed surrounding the subgrain, a relatively coarse recovered region was formed. Such a region was invaded by recrystallized grains and disappeared. In some case, invading a recovered region with other recovered regions was also observed. Difference in these two types of recovery behaviors occurred depending on the orientation relationships among the subgrains. When they have a similar orientation with respect to each other, recrystallized grains were not formed but recovered regions were formed. Subgrains having orientations apart from those of surrounding subgrains grew into recrystallized grains.


(Received 2012/4/20)

Keywords:

aluminum, cold-rolling, recovery, recrystallization, scanning electron microscope-electron backscatter diffraction (SEM-EBSD), same area observation


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