Abstract
Stress corrosion cracking is a typical fracture process for metals and alloys. Among aluminum alloys, the Al−Zn−Mg−Cu group is characterized by high performance as far as its mechanical properties are concerned. However, it is susceptible to stress corrosion cracking. Within this large group, the AA-7075-type alloy is most extensively used in manufacturing light structural components, mainly in the aircraft industry. We study the characteristics of the AA-7075 alloy in a 3.5% NaCl aqueous solution at 20 and 80°C. Stress corrosion cracking was observed for all analyzed AA-7075 temper conditions in different tested environments. It was very rapid at 80°C, especially for the T6-aging condition. In all studied cases, the maximum and minimum susceptibility to stress corrosion cracking were exhibited by the AA-7075-T6 temper and T73 temper, respectively. As compared to AA-7075-T6, the AA-7075-RRA temper has better resistance to stress corrosion cracking but its mechanical properties are lower.
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