High-temperature compressive deformation behaviors of Mg–6Zn–1.5Y–0.5Ce–0.4Zr alloy were investigated at temperatures and strain rates ranging from 523 to 673 K and from 0.001 to 1 s⁻¹, respectively. The studied alloy was mainly composed of α-Mg, Mg₃Zn₆Y (I phase), Mg–Zn–Ce and Mg₃Zn₃Y₂ (W phase). The constitutive equation of Mg alloy was obtained, and the apparent activation energy (Q) was determined as 200.44 kJ/mol, indicating that rare earth phase increases the difficulty of deformation. The work hardening involves three stages: (1) linear hardening stage; (2) strain hardening stage; and (3) softening and steady-state stage. During these three stages, the dislocation aggregation and tangling, dynamic recovery and recrystallization occur sequentially. To characterize the dynamic recrystallization (DRX) volume fraction, the DRX kinetics was investigated using the Avrami-type equation. The deformation mechanism of magnesium alloy under different Zener–Hollomon parameter (Z) value conditions was also studied. At high Z values and intermediate conditions, dislocations rapidly generate and pile up in the alloy. Recrystallization is hardly seen at this time. At low Z condition, the DRX occurs in the alloy.

研究了Mg–6Zn–1.5Y–0.5Ce–0.4Zr合金在523至673 K和0.001至1 s ^-1的温度和应变速率下的高温压缩变形行为。所研究的合金主要由α-Mg，Mg ₃ Zn ₆ Y（I相），Mg-Zn-Ce和Mg ₃ Zn ₃ Y ₂（W相）组成。得到了镁合金的本构方程，其表观活化能（Q）确定为200.44 kJ / mol，表明稀土相增加了变形难度。工作硬化包括三个阶段：（1）线性硬化阶段；（2）应变硬化阶段；（3）软化和稳态阶段。在这三个阶段中，位错聚集和纠缠，动态恢复和重结晶依次发生。为了表征动态重结晶（DRX）的体积分数，使用Avrami型方程式研究了DRX动力学。研究了不同Zener-Hollomon参数（Z）值条件下镁合金的变形机理。在高Z值和中间条件下，位错会迅速产生并堆积在合金中。此时几乎看不到重结晶。在低在Z条件下，DRX发生在合金中。