Abstract
This chapter reviews the process of recovery, which includes all processes that restore a deformed material to an annealed state but that do not involve long-range motion of boundaries. Dislocations can climb and annihilate to reduce the overall dislocation density and the hardness generally follows a logarithmic decay law. Often the heterogeneity of the deformed microstructure results in dislocation cells becoming more sharply defined such that subgrains form with low angle grain boundaries, i.e., only the geometrically necessary dislocations persist. This process is also known as polygonization. Once a subgrain structure has formed, it can coarsen in much the same way as a high angle grain boundary structure. However, the strong variation in mobility with misorientation, allied with the dispersion in misorientation resulting from deformation, means that such coarsening can be heterogeneous, i.e., abnormal subgrain growth occurs, which provides a nucleation mechanism for recrystallization itself. Particle pinning can stabilize subgrain structures, and thus the Smith-Zener theory is relevant.
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