Mg-6.75Zn-0.57Zr-0.4Y-0.18Gd (wt.%) sheet with typical basal texture was produced by cross rolling and annealing. Room temperature tensile tests were subsequently conducted along rolling direction (RD), transverse direction (TD), and diagonal direction (RD45). Deformation mechanism and orientation evolution during the tension were investigated by quasi-in-situ electron backscatter diffraction observation and in-grain misorientation axis analysis. The results indicate that the activation of deformation mechanism mainly depends on the initial grain orientation. For RD sample, prismatic <a> slip plays an important role in the deformation of grains with <0001> axis nearly perpendicular to the RD. With the <0001> axis gradually tilted towards the RD, basal <a> slip becomes the dominant deformation mode. After the tensile fracture, the initial concentrically distributed {0001} pole is split into double peaks extending perpendicular to the RD, and the randomly distributed $\left\{10\overline{1}0\right\}$ pole becomes parallel to the RD. The evolution in {0001} and $\left\{10\overline{1}0\right\}$ poles during tension is related to the lattice rotation induced by basal <a> slip and prismatic <a> slip, respectively. TD and RD45 samples exhibit similar deformation mechanism and orientation evolution as the RD sample, which results in the nearly isotropic mechanical properties in the annealed cross-rolled sheet.

通过交叉轧制和退火生产出具有典型基底织构的Mg-6.75Zn-0.57Zr-0.4Y-0.18Gd（wt.%）板材。随后沿轧制方向（RD）、横向（TD）和对角线方向（RD45）进行室温拉伸试验。通过准原位研究了拉伸过程中的变形机制和取向演化电子背散射衍射观察和晶内取向差轴分析。结果表明，变形机制的激活主要取决于初始晶粒取向。对于RD样品，棱柱<a>滑移在<0001>轴几乎垂直于RD的晶粒变形中起着重要作用。随着<0001>轴逐渐向RD倾斜，基底<a>滑移成为主要变形模式。拉伸断裂后，初始同心分布的{0001}极分裂成垂直于RD延伸的双峰，随机分布的$\left\{10\stackrel{￣}{1}0\right\}$极点与 RD 平行。{0001} 的演变和$\left\{10\stackrel{￣}{1}0\right\}$张力期间的极点分别与基底<a>滑移和棱柱<a>滑移引起的晶格旋转有关。TD 和 RD45 样品表现出与 RD 样品相似的变形机制和取向演化，这导致退火斜轧板具有接近各向同性的机械性能。