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利用电子背散射衍射(EBSD)成像技术,分析了各向异性ZK60镁合金板材原始织构类型;采用单向拉伸实验和拉深实验,研究了ZK60镁合金板材的各向异性行为。通过实验研究了ZK60镁合金板材拉深成形过程的凸耳形成及演变规律。结果表明:拉深件的平均凸耳率随着成形温度的升高而增大,这与平面各向异性系数Δr有密切关系;平均凸耳率随拉深比的增大呈先增大后减小的变化趋势;拉深件凸模圆角部位与轧制方向呈45°的厚向应变高于0°和90°方向,其原因在于该方向具有最大的塑性应变比r;拉深件筒壁减薄区0°方向的厚向应变小于45°和90°方向,其原因在于该方向具有最小的塑性应变比r。
The primary textures of anisotropic ZK60 magnesium alloy sheets were analyzed by electron backscatter diffraction (EBSD) imaging technique. The anisotropic behavior of ZK60 magnesium alloy sheets was studied by means of uniaxial tensile test and deep drawing test. The formation and evolution of lugs in ZK60 magnesium alloy sheet during deep drawing were experimentally studied. The results show that the average lug rate of the drawn part increases with the increase of the forming temperature, which is closely related to the plane anisotropy coefficient Δr. The average lug rate first increases with the increase of the draw ratio The reason is that the direction of the maximum plastic strain ratio r in this direction is r; Thickness strain in the 0 ° direction of the thinned wall region is less than 45 ° and 90 ° because the direction has a minimum plastic strain ratio r.