The recrystallization of copper single crystals during high-temperature tensile deformation has been investigated. The onset of dynamic recrystallization has been examined with respect to critical parameters for the triggering step of recrystallization. The results are at variance with interpretations usually deduced from polycrystal data. Nucleation of dynamic recrystallization is attributed to deformation-induced instabilities of the dislocation structure. The orientations of the recrystallized grains emerge from highorder twin chains, which originate in the orientation of the deformed material.
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