Zn addition to Mg alloys activates non-basal slip or twinning with solute softening effects. On the other hand, the effects of the Zn solute on the macroscopic dislocation behavior and dynamic recrystallization are not completely understood. Moreover, it is unclear if <c+a> slip can be affected by changes in the c/a ratio of solute atoms. This study was conducted to understand the solute strengthening of Zn addition and its effects on the dislocation characteristics and dynamic recrystallization. A hot torsion test was performed on both AM30 and AZ31 alloys up to a high strain to investigate the Zn solute effect on the dislocation characteristics and dynamic recrystallization. The dislocation components of the hot torsioned alloys were evaluated by X-ray line profile analysis and electron backscatter diffraction. The results showed that the Zn solutes slightly accelerate strain accumulation at the initial stages of hot deformation, which accelerated recrystallization at high strain. The dislocation characteristics were changed dynamically by Zn addition: fortified <c+a>-type slip, dislocation arrangement and strain anisotropy parameters. The most important point was that the dislocation characteristics were changed dramatically at the critical strain for recrystallization and high strain regions. The addition of Zn also acted greatly in these strain areas. This indicates that the rapid formation of <c+a>-type slip at the serrated grain boundaries occurs at the initiation of dynamic recrystallization and the increase in the grain triple junction because grain refinement has a great influence on the dislocation characteristics at high strain.

向镁合金中添加 Zn 可激活具有溶质软化作用的非基底滑移或孪晶。另一方面，Zn 溶质对宏观位错行为和动态再结晶的影响尚不完全清楚。此外，尚不清楚 <c+a> 滑移是否会受到溶质原子 c/a 比率变化的影响。本研究旨在了解添加 Zn 的溶质强化及其对位错特性和动态再结晶的影响。对 AM30 和 AZ31 合金进行了高达高应变的热扭转试验，以研究 Zn 溶质对位错特性和动态再结晶的影响。通过X射线线剖面分析和电子背散射衍射评估了热扭曲合金的位错成分。结果表明，Zn 溶质略微加速了热变形初期的应变积累，从而加速了高应变下的再结晶。添加 Zn 动态改变了位错特征：强化的 <c+a> 型滑移、位错排列和应变各向异性参数。最重要的一点是位错特性在再结晶临界应变和高应变区域发生了显着变化。Zn 的添加在这些应变区域也起到了很大的作用。这表明锯齿状晶界处<c+a>型滑移的快速形成发生在动态再结晶的开始和晶粒三联结的增加，因为晶粒细化对高应变下的位错特性有很大影响。