Abstract
For enhance the heating efficiency and the formability of the magnesium alloy and aluminium matrix composite sheets, pulse current is adopted to the gas bulging and stamping processes. During the bulging process of magnesium alloy sheet, the effects of dynamic pulse current on the formed sheet combine both thermoelectricity and electro-plasticity. The effect and the applicability of the pulse current heating have been evaluated. The deformation properties, microstructure characteristics, and dislocation movement of the AZ31 alloy sheet during bulging process by the resistance heating are investigated. And the resistance heating has been adopted to improve the formability of SiCp/2024Al composites in stamping process. The pulse current density achieved 21.7A/mm2 and temperature of SiCp/2024Al composite correspondingly reached to around 400°C in the 50s. The results showed that stainless steel inserts between sheet and copper electrodes successfully prevented the heat dissipation and promote temperature uniformity over the sheet during electrifying. In addition, workpiece formed by the pulse current deep drawing shows better shape retention, surface quality and high geometry dimensional accuracy.
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