STRAIN AGEING OF COMMERCIALLY PURE ALUMINUM.
TECHNION - ISRAEL INST OF TECH HAIFA MATERIAL MECHANICS LAB
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Ageing of annealed commercially pure 99.4 percent aluminum was carried out after pre-straining specimens and holding them under constant strain relaxation or constant stress creep. Assitional ageing experiments were carried out on high purity 99.99 percent 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-straining history of the specimens and the rate of re-straining 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. Author
- Metallurgy and Metallography