摘要：The dislocation mechanisms of dynamic recovery (DRV) in metals of high stacking fault energy (SFE) give rise to steady-state straining dependent on temperature and strain rate due to development of constancy in the spacings of subgrain boundaries (wS, SGB) and of the dislocations within both the SGB and the subgrains. When the grains are large compared to subgrains, the interactions of grain boundaries with SGB are limited to s e rration formation but when one-grain dimension is reduced to about twice the SGB spacing, the interactions begin to define a minimum grain dimension. However, the cellular size defined by the mixture of SGB and GB remains constant at wS along with the stress. In metals of low SFE, the above is seldom attained since dynamic recrystallization (DRX) intervenes to provide new grains more than twice the subgrain size. On a larger scale, transition boundaries between deformation bands lying between diff e rently slipping and rotating bands, become permanent and rapidly rise in angle and take on GB behavior in both DRV (serrations) and in DRX (nucleation sites). The evidence became more precise as techniques advanced through polarized optical, scanning and transmission electron and orientation imaging microscopies; however, deficiencies in each technique often created confusions that were resolved only through detailed comparison of the evidence.
