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High-purity aluminum was severely plastically deformed by miniaturized extrusion-preceded ECAP as well as by cold rolling. Isochronal and isothermal annealing was performed to investigate the recovery and recrystallization behavior by measuring the development of Vickers microhardness and electrical resistivity. Both processes were found to take place which was verified by TEM and EBSD observations. The onset and course of recovery and recrystallization in cold-rolled Al were postponed to higher temperatures and time due to the lower stored deformation energy. The activation energies for recovery and recrystallization estimated from the microhardness response to isothermal annealing match well those of relevant processes, namely those of thermally activated dislocation motion, pipe-, boundary-, and self-diffusion.

Recovery and recrystallization behavior of aluminum processed by extrusion-preceded equal channel angular pressing