Abstract
By tensile test and transmission electron microscopy analysis, microstructural evolution and age hardening in an experimental high-purity Al-Cu-Mg-Ag alloy were investigated during a long period of ageing time. The results show that the experimental alloy has strong age-hardening response that the alloy strength rapidly increases to almost peak-aged condition after aged for only 2 hours. Ω phase and θ' phase control the hardening effects and grow independently as the ageing time prolonged. At the same time, fine secondary-precipitated θ' phase nucleates and grows near dislocations at fine laths of Ω phase which is resulted from the high misfit strain near Q/a interface. These new hardening precipitates compensate the strength loss due to the primary-precipitated Ω phase and θ' phase coarsening. Thus the alloy strength is only a little decrease after ageing for 50 hours at elevated temperature.
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