|
【范围】
|
1.1 Scope:
This specification covers the specific requirements for improved exfoliation resistant alclad aluminum
alloy 7178-T76 sheet and -T7651 plate. 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 aluminum alloy (7178) core with thin layers of an aluminum
alloy (7072) anodic to the core and of approximately equal thickness, bonded to both surfaces
1.2 Classification:
Sheet shall be furnished only in the T76 temper and plate shall be furnished only in the T7651
temper, as specified (See 6.2). Definitions of these tempers are in accordance with AMS-QQ-A-250
and as follows:
T76 -Solution heat-treated and artificially aged sufficient to produce required improved resistance
to exfoliation and stress-corrosion cracking.
T7651 -Solution heat-treated, stress relieved by stretching to produce a permanent set of 2 percent
nominal 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.strRefField
|