Abstract
The effect of aging on the stress corrosion cracking (SCC) behavior of Al−Cu−Li−Mg−Zr(−Ag) alloys such as Weldalite 049 and AA 8090 was studied by the constant elongation test method to investigate their SCC mechanism. The SCC resistance was not very sensitive under the strain rate of 2×10−5/sec, whereas it was significantly decreased under the strain rate of 5×10−6/sec. The SCC preferentially occurred in the intergranular crack mode. The relatively poor SCC resistance of Weldalite 049 in the under-aged condition was improved by aging. Considering the microstructural development during aging, it is related to the dissolution of the precipitation free zone as an anodic area and the strengthening by the coarsening of precipitation.
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