Abstract
The effects of combined deformation and aging on the subsequent mechanical response of high purity 6061 aluminum have been examined. It has been shown that the yield strength of this material can be increased by an appropriate choice of thermomechanical treatment. Furthermore, this increase need not be accompanied by a reduction in the notch toughness below that typically observed in a commercially available alloy. The procedure requires that the alloy be processed to obtain a uniformly tangled dislocation structure. Subsequent aging results in enhanced nucleation and growth of the primary strengthening phase, an intermediate needle-shaped precipitate. This practice involves a four-step age-deform cycle with a total aging time of 4 h at 448 K and a total reduction of 50 pct.
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