Abstract
The deformation characteristics of heart-shaped AZ31 magnesium alloy part with a thickness of 1.0mm were investigated using superplastic gas blow forming in the present work. A heart-shaped part was formed successfully by gas blow forming at 340°C with a strain rate 5×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-3</sup> s <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> . The thickness distribution, grain size and cavitation characteristics were investigated to seek proper superplastic forming mechanism. In addition, another heart-shaped part was also formed by gas blow forming with 1.5MPa at 340°C. SEM image of fracture surface of this part was observed. The results show that grain boundary sliding with vacancy diffusion plays a dominant role during superplastic deformation; meanwhile dynamic recrystallization has taken place during superplastic deformation.
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