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在823 K下对工业用AZ31镁合金板材进行约70%压下量的单道次轧制实验。结果表明,细小的再结晶晶粒不仅分布在轧制板材的剪切带中,同时还存在于板材的表面。剪切带中再结晶晶粒尺寸在0.4~1μm之间。晶粒的显著细化主要来源于流变应力集中过程中所产生的动态再结晶。板材中部的织构为基面织构,织构强度在轧制变形前后未发生明显改变;然而,经过轧制后板材表面织构转变成双峰织构,基面沿板材横向发生倾转。双峰织构的相对强度为26.6,明显高于板材中部织构强度。变形应变的分配差异是板材内部不均匀再结晶及织构差异的主要原因。
The AZ31 magnesium alloy sheet for industrial use was subjected to a single pass rolling test at a reduction of about 70% at 823K. The results show that the fine recrystallized grains are not only distributed in the shear band of the rolled sheet, but also exist on the surface of the sheet. The recrystallized grain size in the shear band is between 0.4 and 1 μm. The significant grain refinement mainly comes from the dynamic recrystallization during the process of flow stress concentration. The texture in the middle of the plate is the basic texture, and the textural strength does not change obviously before and after the rolling deformation. However, the surface texture of the plate changes to bimodal texture after rolling, and the basal plane tilts along the horizontal direction of the plate. The relative intensity of the bimodal texture is 26.6, which is obviously higher than that of the middle of the plate. The difference of deformation and strain distribution is the main reason for the uneven recrystallization and texture difference in the plate.