研究了AZ80镁合金经300℃等通道挤压(ECAP)后的组织、织构与力学性能的演变规律以及第二相析出行为的影响。结果表明:ECAP显著促进了粒状连续析出,可有效节省后续热处理时间。A路径多道次挤压最终获得基面织构;Bc路径挤压后形成基面近似平行于剪切面的织构;第二相析出对ECAP织构特征的形成没有显著影响。用该工艺可获得较高的延伸率(13%-19%),但是抗拉强度过低(<300 MPa),综合机械性能不理想。可通过抑制挤压前的未溶粗大粒子的析出、减少挤压道次和降低挤压温度等措施优化AZ80的析出控制。 The evolution of microstructure, texture and mechanical properties of AZ80 magnesium alloy after ECAP at 300 ℃ and the precipitation behavior of the second phase were studied. The results show that ECAP can significantly promote the continuous precipitation of particles, which can effectively save the subsequent heat treatment time. A multi-pass extrusion finally obtained basal texture; Bc path formed after the extrusion of the base nearly parallel to the shear surface texture; second phase precipitation on the formation of ECAP texture has no significant effect. With this process, higher elongation (13% -19%) is obtained, but the tensile strength is too low (<300 MPa) and the overall mechanical properties are unsatisfactory. The precipitation control of AZ80 can be optimized by suppressing the precipitation of uncoated coarse particles before extrusion, reducing the extrusion pass and reducing the extrusion temperature.