An analysis of superplastic forming to manufacture aluminum and titanium alloy components

Daniel de Almeida Pereira, Mario Henrique Fernandes Batalha, Andre Ferrara Carunchio, Hugo Borelli Resende

Resumo

Some alloys with fine-grain size can present, under certain conditions, a very high ductility and large deformations before rupturing occurs; a condition known as superplasticity. Superplastic forming (SPF) is a technique that takes advantage of this material’s behavior and consists of heating a metallic blank up to a suitable temperature and blow forming it under gas pressure into a die. There is a growing interest in this manufacturing process in many different areas, such as aeronautical, automotive and medical, due to the possibility of manufacturing complex, lightweight geometries, and strong thin shell parts. In this study, analytical approach is used to predict the optimum gas pressure for forming the blank, in order to maintain a controlled strain rate, ensuring superplastic behavior. Two domes are formed using aluminum and titanium, to test the pressure curves and study the phenomena related to superplastic forming.

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