Microstructure evolution, dynamic recrystallization (DRX) behavior and mechanical properties of Mg–6Zn–1Mn-xGd alloys (x = 0, 0.2, 1.0 and 3.0 wt%) were investigated. The results showed that the phase components of as-cast Mg–6Zn–1Mn alloy were comprised of Mg₇Zn₃, α-Mn and α-Mg, while Mg₃Zn₆Gd (I phase) and Mg₃Zn₃Gd₂ (W phase) were detected with the addition of Gd. Gd addition led to finer recrystallized grains, and it retarded DRX process due to the obstruction of nano-scale particles to grain boundaries. All as-extruded alloys exhibited typical basal texture, but Gd addition resulted in a low pole density of basal texture. Mg–6Zn–1Mn-3.0Gd alloy (ZMG613) exhibited a good balance between the strength and ductility with an ultimate tensile strength (UTS) of 354 MPa, yield strength (YS) of 306 MPa and elongation (EL) of 15.7%. Fine grain strengthening, second phase strengthening and dislocation strengthening were mostly contributed to the achievement of high strength. And the excellent ductility was mainly ascribed to the finer grains, weak basal texture, nano-scale I phase and non-basal slip activation.

研究了Mg-6Zn-1Mn- x Gd合金（x  = 0、0.2、1.0和3.0 wt％）的微观组织演变，动态重结晶（DRX）行为和力学性能。结果表明，铸态Mg-6Zn-1Mn合金的相成分由Mg ₇ Zn ₃，α-Mn和α-Mg组成，而Mg ₃ Zn ₆ Gd（I相）和Mg ₃ Zn ₃ Gd _2组成。添加了Gd，检测到了（W相）。Gd的添加导致更细的重结晶晶粒，并且由于阻碍了纳米级颗粒进入晶粒边界而延迟了DRX过程。所有刚挤压的合金均表现出典型的基础织构，但添加Gd导致基础织构的磁极密度低。Mg-6Zn-1Mn-3.0Gd合金（ZMG613）在强度和延展性之间表现出良好的平衡，极限拉伸强度（UTS）为354 MPa，屈服强度（YS）为306 MPa，伸长率（EL）为15.7％。细晶粒强化，第二相强化和位错强化主要是为了获得高强度。优良的延展性主要归因于晶粒细，基层组织薄弱，纳米级I相和非基层滑移活化。