Effect of deformation mode, dynamic recrystallization and twinning on rolling texture evolution of AZ31 magnesium alloys
(1. Engineering Research Center of Continuous Extrusion, Dalian Jiaotong University, Dalian 116028, China;
2. Department of Metallurgy, Graduate School of Engineering, Tohoku University, Aoba, Sendai, 980-8579, Japan)
2. Department of Metallurgy, Graduate School of Engineering, Tohoku University, Aoba, Sendai, 980-8579, Japan)
Abstract: In order to obtain quantitative relationship between (0002) texture intensity and hot rolling conditions, conventional rolling experiments on AZ31 magnesium alloys were performed with 20%-40% reductions and temperatures within the range of 300-500 °C. Shear strain and equivalent strain distributions along the thickness of the rolled sheets were calculated experimentally using embedded pin in a rolling sheet. Rolling microstructures and textures in the sheet surface and center layers of the AZ31 alloys were measured by optical microscopy (OM), X-ray diffractometry (XRD) and electron back scatter diffraction (EBSD). Effects of the rolling strain, dynamic recrystallization (DRX) and twinning on the texture evolution of the AZ31 alloys were investigated quantitatively. It is found that the highest (0002) basal texture intensities are obtained at a starting rolling temperature of 400 °C under the same strain. Strain–temperature dependency of the (0002) texture intensity of the AZ31 alloy is derived.
Key words: magnesium alloy sheet; hot rolling; texture; dynamic recrystallization; twinning