中文摘要：

基于显微镜的阶段地模型，降水机制和微观结构进化上的预先变老温度效果在为 Ni75Al9Cr16 合金的二拍子的圆舞老化期间被模仿。结果证明 L12 阶段的早降水机制是 spinodal 分解和非古典的成核生长的混合机制，而当预先变老温度是 873 K 时， DO22 阶段的早降水机制是 spinodal 分解。L12 阶段的早降水机制是非古典的成核生长，而当预先变老温度是 973 K 时， DO22 阶段的早降水机制是 spinodal 分解。在有弹性的紧张精力的效果下面，立方的粒子展出方向性的排列[100 ] 并且[010 ] 方向在迟了的降水期间，它在更低的温度前是更明显的。DO22 阶段在这些二种降水过程下面比 L12 阶段早出现；并且成核孵化时间随温度前的增加变得长。

英文摘要：

Based on the microscopic phase-field model, the pre-aging temperature effects on the precipitation mechanism and microstructure evolution during two-step aging for Ni75A19Cr16 alloy were simulated. The results show that the early precipitation mechanism of Ll2 phase is the mixed mechanism of spinodal decomposition and non-classical nucleation growth, whereas the early precipitation mechanism of DOzz phase is spinodal decomposition when the pre-aging temperature is 873 K. The early precipitation mechanism of LIz phase is non-classical nucleation growth, whereas the early precipitation mechanism of DOzz phase is spinodal decomposition when the pre-aging temperature is 973 K. Under the effects of elastic strain energy, the cubic particles exhibit directional alignment along [ 100] and [010] directions during the late precipitation, which is more obvious at lower pre-temperature. DOzz phases appear earlier than Llz phases under these two kinds of precipitation processes; and the nucleation incubation time becomes long with the increase of pre-temperature.