Abstract
In order to increase stretch formability of the magnesium-based alloy AZ31 sheets, the hydraulic bulge forming was carried out with the rolled sheets and the forged sheets with thickness of 1.0 mm. The forged sheets with thickness of 1.0 mm has been forged from the rolled sheets with thickness of 3.0 mm at elevated temperature since grain size would be refined in the during reduction. Consequently, in the bulge forming at 473 K, bulge height in the forged sheets have been twice as height as the rolled sheets, and this has been nearly as height as bulge height in the rolled sheets at 573K. What's more, the forming in the forged sheet has enabled to form at lower temperature than the rolled sheet.
