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Creep Age Forming of 2024A, 8090 and 7449 Alloys

Two main aspects of the creep age forming of aircraft structures have been studied: (1) to determine if lower wing skin alloys (2024A and 8090) can be creep age formed (artificially aged), and still retain adequate damage tolerance properties, and (2) to assess the creep formability of the new high strength alloy 7449. It has been found that all three alloys are amenable to creep age forming, with usable springback values and satisfactory tensile and damage tolerant properties being achieved. Compared to control samples (T351 for 2024A, T8651 for 8090 and T7951 for 7449), the creep age forming had no detrimental effect on any of the mechanical properties measured. In particular, adequate damage tolerant properties could be achieved after creep age forming even for the 2024A alloy, normally used in the T351 condition.