Influence of Magnesium Content on Tensile Properties and Deformation Behaviour of Al–Mg–Si Alloy Sheets
摘要
The present study is based on the measurement and effect of Mg content on the tensile behaviour, formability and microstructural characteristics of two different sheets of Al–0.9 Mg–Si and Al–3.1 Mg–Si alloy. The tensile properties of both the sheets have been evaluated by testing laser-cut tensile specimens according to ASTM E8M standard at room temperature. The experimental results indicate that the Al–3.1 Mg–Si alloy, with higher Mg content, exhibits significantly higher yield and tensile strengths, along with nearly double elongation compared to the Al–0.9 Mg–Si alloy. Also, the stretch forming tests revealed better formability in Al–3.1 Mg–Si alloy sheet. Electron backscatter diffraction analysis depicted that the annealed alloy sheet with higher Mg possessed fine equiaxed grains with uniform distribution of Mg2Si particles, contributing to its higher yield and tensile strengths. After plastic deformation, both the sheet samples exhibited elongated grains with a slight reduction in grain size. Pole figure maps indicated that the Al–3.1 Mg–Si alloy has a stronger texture than the Al–0.9 Mg–Si alloy. After the tensile deformation, the texture of Al–3.1 Mg–Si alloy transformed into a very sharp and strong suggesting a better deformation behaviour. These findings provide valuable insights into how magnesium content influences the strain distribution during plastic deformation and microstructural changes in Al–Mg–Si alloys.