Abstract
Hot-rolled Al–17%Cu alloy deforms superplastically at elevated temperatures with large values of strain-rate sensitivity(> 0·30) and large, neck-free elongations (> 200%). Two mechanisms appear to be involved in the deformation process. At lower stresses and strain rates the activation energy of the deformation process is similar to that for grain-boundary diffusion while at higher stresses and strain rates the activation energy corresponds to that for volume diffusion. The room-temperature properties of hot-rolled Al–17%Cu alloy are comparable to those for conventional Al alloys but superplastic deformation at elevated temperature causes a deterioration of room temperature properties because of agglomeration and sintering of the Al2Cu intermetallic phase.
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