Abstract The interactions between dynamic precipitates and dynamic recrystallization (DRX) in hot compressed ZM51 alloys with strain rates from 1 s−1 to 20 s−1 were carefully investigated by optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The DRX grain size and the precipitate volume fraction decrease, while the DRX volume fraction increases with increasing the strain rate (T = 300 °C, e = 1.61). The proportion of β2′ phase is larger than that of β1′ phase, indicating that β2′ phase becomes the main precipitates at the later deformation stage. Grain boundary bowing is the main DRX mechanism at the strain rate of 1 s−1, while the twin-aided DRX mechanism dominates at the higher strain rates (έ ≥10 s−1). The DRX grain size, the volume fractions of the precipitates and DRX increase with increasing the strain (T = 300 °C, έ = 10 s−1). Increasing the strain didn't change the types of the precipitates, but led to the reduction of β1′ phase and the increase of β2′ phase. All the precipitates become spheroid. The higher DRX volume fraction with the lower precipitate volume fraction were detected at the higher strain rates (έ ≥10 s−1), while the situations at the lower strain rate (έ =1 s−1) were reverse. It is due to the fact that the precipitates can hinder the nucleation and growth of DRX because of their pinning effect on dislocations, twin boundaries, sub-grain boundaries and DRX grain boundaries. The precipitation sequence in the deformation process is more complex than that in the traditional aging process and the deformation accelerates the precipitation and phase transformation processes.

中文翻译：

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Mg-5Zn-1Mn合金热压缩过程中动态析出物与动态再结晶的相互作用

摘要 通过光学显微镜 (OM)、扫描电子显微镜 (SEM) 和透射电子显微镜仔细研究了应变速率为 1 s−1 至 20 s−1 的热压缩 ZM51 合金中动态析出物和动态再结晶 (DRX) 之间的相互作用。 (TEM)。DRX 晶粒尺寸和沉淀体积分数减小，而 DRX 体积分数随着应变速率的增加而增加（T = 300 °C，e = 1.61）。β2'相的比例大于β1'相，说明β2'相成为变形后期的主要析出物。晶界弯曲是应变速率为 1 s-1 时的主要 DRX 机制，而双辅助 DRX 机制在更高的应变速率（έ ≥10 s-1）时占主导地位。DRX 晶粒尺寸，沉淀物的体积分数和 DRX 随应变的增加而增加（T = 300 °C，έ = 10 s−1）。增加应变并没有改变析出物的类型，而是导致β1'相的减少和β2'相的增加。所有的沉淀都变成球状。在较高应变率（έ ≥ 10 s-1）下检测到较高的 DRX 体积分数和较低的沉淀体积分数，而在较低应变率（έ = 1 s-1）下的情况相反。这是由于析出物对位错、孪晶界、亚晶界和 DRX 晶界的钉扎作用，会阻碍 DRX 的成核和生长。