Effects of Sn addition (0–1.5 mass%) on dynamic recrystallization (DRX) of Mg-5Zn-1Mn alloy during high strain rate ($\dot{\text{ε}}$=9.1 s⁻¹) deformation are investigated by hot compression testing. With a higher Sn addition, the strain corresponding to the maximum softening rate and the critical strain corresponding to the onset of DRX decrease at first and then increase, while the DRX fraction is just the reverse. The Mg-5Zn-1Mn-0.9Sn alloy shows the biggest DRX extent. Continuous DRX with twin nucleation is the dominant DRX mechanism for all the alloys. The high density dislocations inside twins gradually evolve into the cellular structures and sub-grains by dynamic recovery, and sub-grains turn into the DRX nuclei. The Sn addition can adjust the nucleation rate and the nucleus growth rate of DRX by regulating the inclination for twinning, adjusting stacking fault energy (SFE) and changing the amount of precipitates. Solute Sn atoms not only promote DRX nucleation by increasing twin density but also stimulate the DRX nucleus growth by reducing SFE. With the higher amount of MgZn₂ and Mg₂Sn dislocation-induced precipitates, the negative effect on DRX derived from the precipitates becomes effective, including hindering the formation of cellular structures and preventing the rotation and the growth of sub-grains by the pinning effect.

高应变速率下添加锡（0–1.5质量％）对Mg-5Zn-1Mn合金动态再结晶（DRX）的影响（$\dot{\text{ε}}$= 9.1 s ^-1变形通过热压缩测试进行研究。随着锡的添加量增加，对应于最大软化速率的应变和对应于DRX发生的临界应变先减小然后增大，而DRX分数恰好相反。Mg-5Zn-1Mn-0.9Sn合金具有最大的DRX程度。具有双成核作用的连续DRX是所有合金的主要DRX机制。双胞胎内部的高密度位错通过动态恢复逐渐演变为细胞结构和亚晶粒，而亚晶粒则变成了DRX核。添加锡可以通过调节孪晶的倾角，调节堆垛层错能（SFE）和改变沉淀量来调节DRX的成核速率和核生长速率。溶质Sn原子不仅通过增加孪晶密度来促进DRX核的形成，而且还通过降低SFE刺激DRX核的生长。随着镁锌含量的增加_在Mg ₂ Sn和Mg ₂ Sn错位诱发的析出物中，源自析出物的对DRX的负面影响变得有效，包括阻碍细胞结构的形成以及通过钉扎效应防止亚晶粒的旋转和生长。