Genuine solid-state bonding characteristics of superplastic Al-alloys

Solid-state bonding of superplastic 5083, 7475, and 8090 Al-alloys is studied herein. Press bonding was employed to study the ability of bonding aluminum alloys in air. The test sheets were sealed in a plastic bag filled with argon gas before bonding and directly bonded in air. The bonds produced demonstrated that the bond strength was influence strongly by the bonding parameters and the nature of the material. A large deformation was needed for superplastic Al-alloys to be bonded directly in air. The bondability of different alloys depended on the nature of the oxide layer on the surface and the stability of grain structure. Sealing the test sheets in a plastic bag filled with argon gas could enable a smaller deformation and a shorter holding time to be employed for Al-alloys to be bonded in air.