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Abstract
A series of experiments were performed under various strain rates and strain states during superplastic deformation of a fine-grained 5083 aluminum alloy. Uniaxial tensile tests, rectangular pans, hemispherical and cylindrical capped parts were superplastically deformed to study the effects of forming rates and strain states on the nucleation and growth characteristics of cavities. The results showed that cavity fraction increased with increasing temperature due to greater grain growth. Strain states did have an effect on the cavity fraction in formed parts. A two-step strain rate deformation process could reduce cavitation.
