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The superplastically formable aluminium alloy AA5083 has good weldability, reasonable corrosion resistance and strength. In order to test the formability of this alloy, blanks were formed by pressurised gas into cones at constant strain rates. For this, a new analytical model was developed. The cone-cup testing method has been used to study the influence of a pulsating strain rate on the formability of this aluminium alloy. The forming operations were performed using an inhouse designed and built equipment for superplastic matrices forming. The process was also modelled using a finite element code. Preliminary results are presented.

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This paper deals with pneumatic bulging of Magnesium AZ31 sheet metal and AZ31 tubes at elevated temperatures. Flow-stress curves determined by tensile tests and pneumatic bulging at different forming temperatures and strain rates are presented for magnesium AZ31 sheet metal. It is shown that based on basic investigations an automotive sheet-metal component can be formed at elevated temperatures. To determine the material properties of magnesium tubes, tensile tests have been conducted at different forming temperatures and constant strain rate. It is shown how a forming process followed by a heat treatment process influences the microstructure and the formability of magnesium AZ31 tubes.