Abstract:The influence of intermediate recrystallization annealing and final recovery annealing on the strength of 5456 aluminum alloy sheet, which could not be strengthened by heat treatment, was investigated. The corresponding micro-mechanism of that influence on the strength was discussed. The introducing of intermediate recrystallization annealing during cold rolling will change the cold deformation degree, defect structure state and the volume fractions of different texture components of cold rolled sheet, and therefore the strength of work hardening will be influenced directly, and the strength levels as well as the strength anisotropy after the final recovery annealing will also be influenced indirectly. The strength levels in different directions could be adjusted by an optimized combination of intermediate recrystallization annealing and final recovery annealing.

Key words: aluminum alloy　rolling deformation　texture　work hardening　anisotropy