Abstract
Ageing of annealed commercially pure (99.4%) aluminum was carried out after pre-straining specimens and holding them under constant strain (relaxation) or constant stress (creep). Additional ageing experiments were carried out on high-purity (99.99%) aluminum. It was found that reloading commercially pure aluminum after ageing results in hardening and the appearance of a sharp yield point. The amount of hardening depends on many factors: the strain, the stress level and the time of ageing, as well as the pre-staining history of the specimens and the rate of re-staining after ageing. The strain-rate dependence of the upper yield point of the impure material and that of the yield point of the pure material after ageing are approximately the same.
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