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QQ-A-250/22

Revision A, June 27, 1974

Base Document Only

ALUMINUM ALLOY, 7178-T76, PLATE AND SHEET ALCLAD (IMPROVED EXFOLIATION RESISTANT)



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Description / Abstract:

This alloy is intended for use where high strength is required and where exfoliation and stress corrosion resistance superior to 7178-T6 is required in high performance military aircraft. FIGURE 1 75X - UNETCHED STRESS CORROSION CRACKS IN 7178-T7651 SPECIMEN.
NOT ACCEPTABLE FIGURE 2 75X - UNETCHED PITTING TYPE ATTACK IN 7178-T7651. ACCEPTABLE