On Parameters Related to Continuous and Discontinuous Recrystallization and Subsequent Grain Growth

摘要

Ultra-fine grain structure of less than 5 mu m grain size in aluminum and aluminum alloys can be obtained by continuous recrystallization and dynamic recrystallization under different types of deformation such as compression, swaging and cold rolling. The occurrence of continuous recrystallization and dynamic recrystallization is determined by various parameters, mainly by the solute Fe level in the aluminum matrix, but also by the initial grain size, the local strain state, the specific orientation of each individual crystallite and the mis-orientation at the grain boundaries. The subsequent grain growth is greatly affected by these parameters as well as the equilibrium and non-equilibrium segregation of Fe solute to the newly formed grain boundaries, and the interaction of precipitate particles with the migrating grain or subgrain boundaries.