Title :
Gas blow forming of AZ31 magnesium alloy sheet in a heart-shaped closed die
Author :
Yandong Yu ; Peng Jiang ; Caixia Li ; Changping Chen
Author_Institution :
Sch. of Mater. Sci. & Eng., Harbin Univ. of Sci. & Technol., Harbin, China
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 5×10-3s-1. 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.
Keywords :
blow moulding; dies (machine tools); magnesium alloys; plastic deformation; recrystallisation; scanning electron microscopy; sheet materials; superplasticity; AZ31 magnesium alloy sheet; SEM image; dynamic recrystallization; fracture surface; gas blow forming; heart-shaped AZ31 magnesium alloy; heart-shaped closed die; pressure 1.5 MPa; superplastic deformation; superplastic forming mechanism; superplastic gas blow forming; temperature 340 C; Educational institutions; Image edge detection; Metals; Microstructure; Surface morphology; Thickness measurement; AZ31 magnesium alloy; gas blow forming; heart-shaped part; superplasticity;
Conference_Titel :
Strategic Technology (IFOST), 2011 6th International Forum on
Conference_Location :
Harbin, Heilongjiang
Print_ISBN :
978-1-4577-0398-0
DOI :
10.1109/IFOST.2011.6020999
