Recrystallization of a Polygonized Molybdenum Crystal: Relation Between Dislocation Rearrangements and Formation of a New Orientation

The mechanism of recrystallization is considered from a new standpoint using the results of a study of specially prepared single-crystal molybdenum specimens and with allowance for the relation between rearrangements of dislocations in the crystal and the appearance of a new orientation of recrystallized regions. It is shown that the reorientation of recrystallized microvolumes in a crystal is determined by the axis of their bending during deformation. The suggested mechanism makes it possible to explain extreme cases of recrystallization relaxation in metals from a single standpoint, i.e., in terms of the appearance and growth of recrystallization nuclei (polycrystals and highly strained single crystals) and in terms of the instantaneous “thermal” fragmentation into large recrystallized regions (weakly strained single crystals).