A Mg-Gd-Y-Zn-Zr magnesium alloy with different initial states was extruded under different extrusion parameters. The effect of solution treatment and extrusion parameters on the microstructure, texture and mechanical properties were analyzed in detail, and the abnormal texture formation and strengthening mechanism was revealed. When extruded at low temperature and small extrusion ratio, the bimodal microstructure consisting of fine dynamically recrystallized grains and coarse deformed grains occurred both in the as-cast alloy and solution-treated alloy. When the extrusion temperature and extrusion ratio were increased, the amount and size of dynamically recrystallized grains increased and the grain size of the solution-treated alloy showed higher growth rate. Furthermore, an abnormal texture with <0001> parallel with extrusion direction developed due to the occurrence of non-basal slip and continuous dynamic recrystallization. This could be enhanced by solution treatment, high temperature, and large extrusion ratio. Both the as-cast alloy and solution-treated alloy exhibited the highest tensile strength after extrusion at 300 °C with an extrusion ratio of 9. Grain refinement was the main strengthening mechanism utilized in both the as-cast alloy and the solution-treated alloy. Work hardening played an important role in the sample extruded at low temperature and small extrusion ratio, with the highest contribution of about 33 MPa after extrusion at 300 °C with an extrusion ratio of 9. Texture strengthening contributed more in the sample extruded at high temperature and large extrusion ratio, but no more than 24.1 MPa. Solution strengthening was another strengthening mechanism in the extruded as-cast alloy, especially at high temperature and large extrusion ratio (no more than 9 MPa).

以不同的挤压参数挤压出具有不同初始状态的Mg-Gd-Y-Zn-Zr镁合金。详细分析了固溶处理和挤压参数对组织，织构和力学性能的影响，揭示了异常织构的形成和强化机理。当在低温下以低挤出比挤出时，在铸态合金和固溶处理合金中均会出现由细小动态再结晶晶粒和粗大变形晶粒组成的双峰组织。当增加挤出温度和挤出比时，动态再结晶晶粒的数量和尺寸增加，并且固溶处理的合金的晶粒尺寸显示出更高的生长速率。此外，<0001>的异常纹理 由于发生了非基面滑移和连续动态再结晶，因此与挤压方向平行。这可以通过固溶处理，高温和大挤出比来增强。铸态合金和固溶处理合金在300°C挤压后均具有最高的拉伸强度，挤出比为9。细化晶粒是铸态合金和固溶处理合金的主要强化机理。 。加工硬化在低温和低挤压比的样品中起着重要作用，在300°C挤压后，挤压比为9时，最大贡献约为33 MPa。织构强化在高温下挤压的样品中贡献更大挤出比大，但不大于24.1MPa。