Effect of annealing on forming limit curves of 1050 aluminum sheets

Abstract

Characteristic parameters for plastic deformation and textures of 1050-H18 aluminum sheets annealed at various temperatures were determined. When only recovery occurs at low annealing temperatures the limit strain slightly increases. When recrystallization occurs at elevated annealing temperatures, the limit strain remarkably increases. The limit strain is, however, not so affected by grain growth. The variation in the limit strain well corresponds to variation in the n-value of annealed sheets. Variation in the r-value has less effect on the limit strain than the n-value. The texture has no difinite effect.