Effect of grain boundary angle on anisotropic behavior of Al-Mg-Sc-Zr alloy sheets

Abstract

Grain boundary optimization of Al-Mg-Sc-Zr alloy was carried out by multi-directional forging and annealing treatment, and the effects of mixed grain boundary structures on the anisotropic behavior of mechanical properties of alloy sheets were investigated. The results show that the homogenized alloy which mainly possesses high angle grain boundaries tends to form rolled shear bands and high intensity Brass, Copper and S textures after rolling deformation, resulting in obvious mechanical properties anisotropy of rolled sheet. The IPAYS of yield strength and IPAUTS of ultimate tensile strength are 6.68% and 5.85%, respectively. After multi-directional forging and annealing treatment, the matrix of the alloy is a mixed crystal structure with high/low angle grain boundary structures. After rolling deformation, the shear band density and texture intensity decrease obviously, resulting in the obvious improvement of the anisotropy of the alloy rolled sheet.

Keywords

• al-mg-sc-zr alloy
• anisotropy
• shear band
• misorientation angle
• deformation texture