Torsional Deformation and Static Recrystallization Behavior of Aluminum Single Crystal
In this paper,<123>-oriented aluminum single crystals were deformed by unidirectional torsion followed by annealing treatment.The microstructure evolution and static recrystallization behavior of aluminum single crystal samples after annealing were characterized by electron backscatter diffraction(EBSD).The results show that the lattice rotation occurs in the aluminum single crystal,and the deformed matrix was composed of microbands(MBs)parallel to the active slip plane {111} during torsional deformation at room temperature.The mutual absorption of dislocations promotes the dislocation accumulation,which results in the lattice rotation and orientation scattering of the deformed aluminum single crystals.When the annealing temperature is 500 ℃,the nucleation and growth of the secondary recrystallization grains significantly increase due to the accelerated grain boundary migration rate.The preferential growth of the secondary recrystallization grains with misorientation of 20°-45° high-energy grain boundaries,resulting in a continuous growth of the grain size to about 1 mm.The nucleation of recrystallizations was rotated 20°-60° around the<111>,<123>and<122>directions by adjacent deformed matrix,and the 30°-50°<111>orientation relationship gradually dominates with the increasing of strain and annealing temperature.
aluminum single crystalstorsional deformationannealing treatmentstatic recrystallizationorientation relationships
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