Abstract
Strength and SCC resistance of RRA-treated 7050 aluminum alloy were investigated, compared with the alloy conven-tional-treated. Over-aging treatments such as T76 and T73 were effective for the improvement of SCC resistance, but a certain loss in strength was unavoidable. The RRA-treatment for 7050 alloy improved the SCC resistance up to the level compared to that of T73. Far from decreasing, the strength of RRA-treated alloy increased slightly, compared with T6. The strength obtained in T6 treatment and the SCC resistance in T73, therefore, can completely coexist in the case of RRA-treated alloy. This special effectiveness for the 7050 alloy was considered to result from homogeneity in the precipitation structure of 7050 alloy, probably induced by the zirconium addition in 7050 alloy.
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