The deformation mechanism and microstructure evolution of the extruded Mg2Nd alloy were investigated in the hot tensile deformation process at strain rate of 2.2 × 10⁻⁴ s⁻¹ and deformation temperatures of 150 °C–300 °C. the results showed that the peak stress declines and the elongation to fracture increases with the increasing of deformation temperature. By observation of the microstructure, the fibrous extrusion zones (FEZs) and non-fibrous extrusion zones (non-FEZs) coexist in the alloy, and the microstructure deformation of the FEZs is more obvious than that of the non-FEZs. In the initial deformation stage, the grain deformation first occurs in the FEZs. In the later deformation stage, recrystallization occurs in both FEZs and non-FEZs. Moreover, the deformation mechanism of the FEZs is different from that of the non-FEZs. The deformation mechanism of the FEZs is dominated by intragranular slip, supplemented by grain boundary slip (GBS). The recrystallization mechanism in FEZs is continuous dynamic recrystallization (CDRX). On the contrary, the deformation of the non-FEZs is dominated by GBS, while the intragranular slip plays a coordinated role. The recrystallization mechanism in non-FEZs is discontinuous dynamic recrystallization (DDRX). Therefore, the dominated hot tensile deformation mechanisms of the alloys are alternated among intragranular slip, GBS and dynamic recrystallization (DRX)

在应变速率为 2.2 × 10 ^-4  s ^-1的热拉伸变形过程中研究了挤压 Mg 2Nd 合金的变形机制和显微组织演变。变形温度为 150 °C–300 °C。结果表明，随着变形温度的升高，峰值应力下降，断裂伸长率增加。通过组织观察，合金中纤维挤压区（FEZs）和非纤维挤压区（non-FEZs）共存，FEZs的微观组织变形比non-FEZs更明显。在初始变形阶段，晶粒变形首先发生在 FEZ 中。在后期变形阶段，再结晶发生在 FEZ 和非 FEZ。此外，FEZ 的变形机制与非 FEZ 的变形机制不同。FEZs的变形机制以晶内滑移为主，辅以晶界滑移（GBS）。FEZ 中的再结晶机制是连续动态再结晶 (CDRX)。相反，非FEZs的变形以GBS为主，而沿晶滑移则起协调作用。非 FEZ 中的再结晶机制是不连续动态再结晶 (DDRX)。因此，合金的主要热拉伸变形机制在晶内滑移、GBS和动态再结晶（DRX）之间交替。