Abstract
The migration of recrystallization boundaries into spatially varying deformation energy fields are simulated based on a two-dimensional phase-field model. The energy fields are chosen as idealized versions of deformation microstructures subdivided by two sets of intersecting geometrically necessary dislocation boundaries (GNBs), and effects of the sharpness of the GNBs are investigated. The simulations show that the shape of the recrystallizing grain as well as the recrystallization kinetics are considerably affected by the wall characteristics of the GNBs. Recrystallization occurs faster in the deformed matrix with “sharper” walls. The simulation results highlight the importance of the deformation microstructure characteristics on the recrystallization kinetics, and as the deformation microstructures depend on the initial grain orientations, the results also indicate tight relations between initial, deformation and recrystallization textures.
Highlights
Annealing of a deformed metal typically leads to recrystallization by which the deformed grains are replaced by new almost perfect grains: A recrystallized grain has a much lower density of dislocations than that in the deformed matrix [1]
The energy fields are chosen as idealized versions of deformation microstructures subdivided by two sets of intersecting geometrically necessary dislocation boundaries (GNBs), and effects of the sharpness of the GNBs are investigated
The simulations show that the shape of the recrystallizing grain as well as the recrystallization kinetics are considerably affected by the wall characteristics of the GNBs
Summary
Annealing of a deformed metal typically leads to recrystallization by which the deformed grains are replaced by new almost perfect grains: A recrystallized grain has a much lower density of dislocations than that in the deformed matrix [1]. Recently has it been demonstrated that curvature driving and dragging forces related to sharp retrusions and protrusions on migrating recrystallization boundaries may be of the same order of magnitude [3]. Important for both the local stored energy distribution and the curvature forces is how the dislocations are arranged in the matrix. This distribution is, in almost all cases, heterogeneous, as the dislocations arrange to minimize their energy as much as possible into low energy dislocation structures [4].
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