中文摘要：

采用Gleeble-3500热力模拟试验机在变形温度300--450℃、应变速率0.001-1 s-1条件下进行单轴压缩试验，研究ZX115（Mg-1.0%Zn-1.5%Ca（质量分数））合金热压缩过程中的组织演变及再结晶形核机制。结果表明：ZX115合金在热压缩过程中发生了明显的动态再结晶，再结晶晶粒尺寸随着变形温度的升高或应变速率的降低而增大。合金在不同变形条件下的动态再结晶机制有所差异，主要有孪生动态再结晶、不连续动态再结晶和第二相粒子促进动态再结晶等方式。

英文摘要：

The microstructure evolution and dynamic recrystallization （DRX） of ZX115 （Mg-1.0%Zn-1.5%Ca （mass fraction）） magnesium alloy during hot compression were studied. The uniaxial compression was conducted on a Gleeble-3500 simulator at different deformation temperatures （300-450℃） and strain rates （0.001-1 s-1）. The results show that the DRX can be found in compressed ZX115 alloy during hot compressing. With the increase of the deformation temperatures or the decreases of the strain rates, the recrystallized grain size increases. Under different deformation conditions, the nucleation mechanism of dynamic recrystallization including twin induced nucleation, discontinuous nucleation, the second phase particle stimulated nucleation of DRX, and so on, can be found.