Abstract
The rolled AZ31 Mg alloy sheets were processed by multi-pass bending (MPB) process at room temperature and followed by annealing treatment. Mechanical properties of the as-received and MPB sheets in annealed conditions were examined based on the concurrent microstructure and texture evolution. The results show that the room temperature ductility of the Mg sheets was improved by multi-pass bending process. Moreover, the (0002) basal texture was drastically weakened. Enhanced the ambient mechanical properties, such as lower yield strength and larger uniform elongation, were fabricated by MPB path due to the weak basal texture. The microstructure and mechanical responses were characterized and discussed.
Highlights
Magnesium (Mg) alloys have attracted considerable attention for a promising application in the automotive and electronics owing to their high specific strength and high electromagnetic shielding 1-5
It was ascribed to the large difference in critical resolved shear stresses (CRSS) between basal and prismatic slip in hexagonal close-packed crystal structure in Mg alloys . 8-12 This results in a lack of the active slips systems and can hardly offer an arbitrary shape change at the grain level
The plastic deformation modes of wrought Mg alloys depend on a combination of basal slip, non-basal slip and deformation twinning . 13-16 The basal slip is willingly to activate at room temperature because of the low CRSS 1719, which results in Mg alloy sheets show a strong (0002) basal texture after plastic deformation
Summary
Magnesium (Mg) alloys have attracted considerable attention for a promising application in the automotive and electronics owing to their high specific strength and high electromagnetic shielding 1-5. The application of wrought Mg alloys has been limited by poor room temperature ductility 6,7. The plastic deformation modes of wrought Mg alloys depend on a combination of basal slip, non-basal slip and deformation twinning . 13-16 The basal slip is willingly to activate at room temperature because of the low CRSS 1719, which results in Mg alloy sheets show a strong (0002) basal texture after plastic deformation. 20,21 It has been reported that the ambient ductility of Mg alloy sheets strongly depends on the influence of the initial crystallographic texture of basal plane . 22,23 This strong texture induces a poor deformation capability of sheet thinning and a stronger anisotropy, and results in the low room temperature ductility. The texture control should be considered as an effective way to enhance the ductility in the following deformation processes at room temperature. The effect of multi-pass bending deformation on microstructure and mechanical properties of the rolled AZ31 alloy sheets was examined, which supplies a range of possible texture evolution to explore
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