Abstract
The effect of the aged treatment on the creep resistance of Al–Cu–Mg–Ag alloy was investigated by creep test, metallographic and transmission electronic analysis. The results indicate that the creep rate of the under-aged sample is lower to than that of the peak-aged sample in the tested conditions. This means that the under-aged Al–Cu–Mg–Ag alloy possess higher creep resistance both in the pure creep tests and the cyclic creep tests. The grains in the crept samples are elongated along the stress loading direction and the larger deformation is observed in the peak-aged sample. The precipitations are distributed dispersive in the matrix and their size is smaller than that in the peak-aged sample. This results in the higher creep resistance of the under-aged Al–Cu–Mg–Ag alloy.
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