Abstract: The stress corrosion cracking (SCC) Behavior in 3.5% NaCl solution of Al-Li-Cu-Mg-Zr alloy stretched prior to aging has been studied by the slow strain rate and constant strain test, and its tensile properties have been tested. The results show that the predeformation raises the SCC resistance and strength of the alloy. The alloy predeformed 4% for strecth has the lowest susceptibility on the SCC and the highest utmost elongation. Increasing the stretch from 4% to 8% has no observable effect on the SCC susceptibility and causes no obvious decrease of the elongation of the expriment alloy. The correlation between the SCC behavior, tensile properties and the micorstructure of the alloy was inverstigated by means of transmission electron microscopy (TEM).

Key words: Al-Li alloy, stress corrosion, predeformation