Superplastically-formable Al-Mg-Si product and method

A superplastically formable, aluminum alloy product which consists essentially of:

• about 2-3.8 wt. % magnesium;
• at least one dispersoid-forming element selected from the group consisting of:
• up to about 1.6 wt. % manganese, up to about 0.2 wt. % zirconium, and up to about 0.3 wt. % chromium;
• at least one nucleation-enhancing element for recrystallization selected from:
• between about 0.1-1.0 wt. % silicon, up to about 0.8 wt. % copper, and combinations thereof, the balance incidental elements and impurities, said alloy product having greater than about 225% elongation at a strain rate of at least about 0.0003/sec and a superplastic forming temperature between about 950-1135.degree. F. from having been, after hot rolling to an intermediate gauge, solution heat treated at one or more temperatures between about 1000-1000.degree. F., quenched at a drastic cooling rate and cold rolled to greater than about 60% reduction without intermediate annealing.