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【范围】
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1.1 Scope:
This specification covers the specific requirements for 7178 aluminum alloy, 7011 alclad, plate and
sheet; the general requirements are covered in AMS-QQ-A-250. The plate and sheet covered by
this specification shall be an integral composite product consisting of a heat-treatable 7178
aluminum alloy core with thin layers of a 7011 aluminum alloy anodic to the core and of
approximately equal thickness, bonded to both surfaces.
1.2 Classification:
1.2.1 Tempers: The plate and sheet are classified in one of the following tempers as specified (See 6.2):
O T6, T62, T651 T76, T7651, or F temper (See 6.3). Definitions of these tempers are specified in
AMS-QQ-A-250 and as follows:
O -Annealed
T6 -Solution-heat-treated and artificially aged.
T62 -Solution-heat-treated from the O or F temper to demonstrate the response to heat-
treatment, and artificially aged.
T651 -Solution-heat-treated, stress relieved by stretching to produce a nominal permanent set of
2 percent but not less than 1-1/2 nor more than 3 percent, and artificially aged. Plate shall
receive no further straightening after stretching.
T76 -Solution-heat-treated and artificially aged sufficient to produce improved resistance to
exfoliation.
T7651 -Solution-heat-treated, stress relieved by stretching to produce a nominal permanent set of
2 percent but not less than 1-1/2 nor more than 3 percent, and artificially aged sufficient to
produce improved resistance to exfoliation and stress corrosion cracking. Plate shall
receive no further straightening after stretching.
F -As fabricated.strRefField
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