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 static recrystallization of hot-deformed magnesium alloy AZ31 during isothermal annealing were investigated at temperature 503 K by optical and SEM/EBSD metallographic observation. The grain size (D) change during isothermal annealing is categorized into three regions, i.e. an incubation period for grain growth, rapid grain coarsening, and normal grain growth. The number of fine grains per unit area, however, is reduced remarkably even in incubation period. This leads to grain coarsening taking place continuously in the whole period of annealing. In contrast, the deformation texture scarcely changes even after full annealing at high temperatures. It is concluded that the annealing processes operating in hot-deformed magnesium alloy can be mainly controlled by grain coarsening accompanied with no texture change, that is, continuous static recrystallization.
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