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对热变形AZ31镁合金的显微组织、晶粒尺寸分布、平均晶粒尺寸、再结晶晶粒数目以及变形织构随退火时间的变化进行了定量分析,研究了不同热变形量AZ31镁合金在503 K的等温退火行为。结果表明:热变形AZ31镁合金的细晶组分随着退火时间的延长不断降低,退火过程按退火温度可分为孕育、再结晶急速长大和晶粒正常长大三个阶段,且各阶段的其长短几乎不受变形程度的影响。变形形成的微观织构在整个退火过程中几乎没有变化,说明热变形镁合金在退火过程中没有新核形成,即为连续静态再结晶。
The microstructure, grain size distribution, average grain size, the number of recrystallized grains and the deformation of textured AZ31 magnesium alloy with annealing time were quantitatively analyzed. The effects of different thermal deformations on the microstructure, 503 K isothermal annealing behavior. The results show that the fine grain composition of hot deformed AZ31 magnesium alloy decreases with the extension of annealing time. The annealing temperature can be divided into three stages of inoculation, rapid recrystallization and normal growth of grains according to the annealing temperature. Its length is almost not affected by the degree of deformation. The micro-texture formed by deformation has almost no change during the entire annealing process, indicating that no new nuclei are formed during the annealing of the hot-deformed magnesium alloy, that is, the continuous static recrystallization.