A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Pulse current auxiliary bulging and deformation mechanism of AZ31 magnesium alloy
Highlights ► Pulse current was adopted to gas bulging process. ► Formability of coarse-grained AZ31 magnesium alloy has been enhanced. ► The formability improvement mechanism was analyzed. ► The asymmetrical contour of the free bulging sample was observed and analyzed.
Abstract The effects of pulse current on the deformation behavior, dislocation structure, microstructural evolution and cavity morphology of the coarse-grained (25μm) AZ31 magnesium alloy during gas bulging process were investigated. The tests of pulse current auxiliary bulging (PCAB) showed that the formability of the alloy was improved as the increase in the peak current density. The results of TEM and SEM analysis showed that the dislocation motion was mainly glide, and the dislocation lines were approximate parallel with few dislocation tangles observed. Moreover, a part of cavity tips turned into circular bead by the concentration of the pulse current, and the rounding effect would lead to the relaxing of the high stress concentrated near the cavity tips. These phenomena indicated that the pulse current not only increased the dislocation motion but also restrained the cavity growing during PCAB process. In addition, the asymmetrical contours of the free bulging samples were observed and their forming mechanism was analyzed.
Pulse current auxiliary bulging and deformation mechanism of AZ31 magnesium alloy
Highlights ► Pulse current was adopted to gas bulging process. ► Formability of coarse-grained AZ31 magnesium alloy has been enhanced. ► The formability improvement mechanism was analyzed. ► The asymmetrical contour of the free bulging sample was observed and analyzed.
Abstract The effects of pulse current on the deformation behavior, dislocation structure, microstructural evolution and cavity morphology of the coarse-grained (25μm) AZ31 magnesium alloy during gas bulging process were investigated. The tests of pulse current auxiliary bulging (PCAB) showed that the formability of the alloy was improved as the increase in the peak current density. The results of TEM and SEM analysis showed that the dislocation motion was mainly glide, and the dislocation lines were approximate parallel with few dislocation tangles observed. Moreover, a part of cavity tips turned into circular bead by the concentration of the pulse current, and the rounding effect would lead to the relaxing of the high stress concentrated near the cavity tips. These phenomena indicated that the pulse current not only increased the dislocation motion but also restrained the cavity growing during PCAB process. In addition, the asymmetrical contours of the free bulging samples were observed and their forming mechanism was analyzed.
Pulse current auxiliary bulging and deformation mechanism of AZ31 magnesium alloy
Li, C. (author) / Zhang, K.F. (author) / Jiang, S.S. (author) / Zhao, Z.P. (author)
2011-08-03
9 pages
Article (Journal)
Electronic Resource
English
Pulse current auxiliary bulging and deformation mechanism of AZ31 magnesium alloy
| British Library Online Contents | 2012
Formability of AZ31 magnesium alloy sheets during magnetic pulse bulging
| British Library Online Contents | 2013
| British Library Online Contents | 2014
Deformation Asymmetry of AZ31 Wrought Magnesium Alloy
| British Library Online Contents | 2002
Deformation modes and anisotropy in magnesium alloy AZ31
| British Library Online Contents | 2009