The morphology and kinetics evolution of the γ′(Ni3Al) phase during re-dissolution are studied in Ni-15 at% Al alloy, the changes of volume fraction and average particle radius of the γ′ phase were clarified with phase-field simulation. During isothermal aging, the interdistance of the neighboring γ′ phase affects the interface concentration gradient of Al, which dominates the growth or re-dissolution of the γ′ phase particle. After isothermal aging at 700 K, the alloy is continuously heated to 900 K with different heating rates, the re-dissolution lag happens, meaning the coalescence coarsening of adjacent γ′ phase particles still proceeds at the initial heating stage. The pre-dissolution of γ′ phase with cubic shape is re-dissolved firstly at the edges and corners, in continuous heating to 900 K or by second-order aging from 700 to 900 K. Different from continuous heating, in the second-order aging process, the connected particles with band shape are broken initially by re-dissolving. At different heating rates, the similar dynamic relationships are abstracted for the volume fraction and the heating rates, and the average particle radius and the heating rates.

中文翻译：

---

Ni-Al合金中γ′相连续二次时效再溶解的相场模拟

研究了Ni-15 at% Al合金再溶解过程中γ'(Ni3Al)相的形貌和动力学演变，通过相场模拟阐明了γ'相体积分数和平均颗粒半径的变化。在等温时效过程中，相邻 γ' 相的间距会影响 Al 的界面浓度梯度，从而主导 γ' 相粒子的生长或再溶解。合金在 700 K 等温时效后，以不同的加热速率连续加热至 900 K，发生再溶解滞后，这意味着相邻 γ' 相颗粒的聚结粗化仍在初始加热阶段进行。立方形γ′相的预溶解首先在棱角处重新溶解，连续加热到900 K或通过700-900 K的二级时效。与连续加热不同的是，在二级时效过程中，带状连接的颗粒通过重新溶解而被初步破坏。在不同的加热速率下，体积分数和加热速率、平均颗粒半径和加热速率的相似动态关系被抽象出来。