Abstract
Comparisons have been made of the fatigue and creep behaviour of the aged alloys Al-4%Cu-0.3%Mg with and without the addition of 0.4% of silver or cadmium, each of which is hardened by different precipitates. Fatigue behaviour was similar in each case and was controlled by microstructure. It was not related to the tensile properties. On the other hand, the creep performance of the fully hardened alloys increased with increasing levels of tensile properties. Contrary to expectations, best creep performance was recorded for the silver-containing alloy in the lower strength, underaged condition.
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