在低周疲劳过程中，挤压镁合金由于其各向异性导致其循环变形机制存在明显差异。而在应力控制条件下，织构对循环变形过程的影响除了变形机制之外，还存在着棘轮应变的影响。为了研究在应力控制下织构对循环变形过程及疲劳寿命的影响，本文沿着挤压方向（ED）和横向方向（TD）制备两种不同织构的样品，选取在不同应力水平下的压-压疲劳的加载方式进行实验。结果表明：织构对挤压镁合金的循环变形过程和疲劳寿命有显著影响。由于初始织构不同，在循环初期ED样品主导变形机制为孪生机制，而TD样品则以位错滑移为主，而且ED方向产生的棘轮应变大。随着循环的进行，无论ED还是TD样品主要变形机制均转化为位错变形机制，ED样品中残余孪晶对位错的阻碍作用导致相对TD样品更明显的循环硬化行为。在循环过程中，TD样品c-轴在TD面上随机分布决定了TD样品相对于ED样品可启动的位错变形机制更多，同时部分孪生机制也可能具有较高的Schmid因子，表现出更大的棘轮应变、塑性应变幅以及塑性应变能密度，从而导致较短的疲劳寿命。

During low-cycle fatigue, extruded magnesium alloys have significant differences in their cyclic deformation mechanisms due to their anisotropic. And under stress-controlled conditions, the influence of the texture on the cyclic deformation process exists in addition to the deformation mechanism, but also the influence of the ratcheting strain. In order to study the effect of texture on the cyclic deformation process and fatigue life under stress control, this paper prepares two samples with different textures along the extruded direction(ED) and transverse direction(TD), and selects the loading mode of compression-pressure fatigue at different stress levels for experiments. The results show that the texture has a significant effect on the cy-clic deformation process and fatigue life of extruded magnesium alloys. Due to the different initial textures, the dominant deformation mechanism in the ED samples is dominated by the twinning at the early stage of cycling, while the TD samples are dominated by the dislocation slip, and the ratcheting strain generated in the ED direction is large at the early stage of cy-cling. As cycling proceeds, the main deformation mechanism of both ED and TD samples is transformed into dislocation deformation mechanism, and the hindering effect of dislocations by residual twins in the ED samples leads to a more pro-nounced cyclic hardening behavior relative to the TD samples. During the cycling process, the random distribution of the c-axis of the TD samples on the TD plane determines that more dislocation deformation mechanisms can be initiated in the TD samples relative to the ED samples, and the occurrence of twinning may also have a higher Schmid factor, and thus exhibit greater ratcheting strain, plastic strain amplitude, and plastic strain energy density, which leads to a shorter fatigue life.