Ni75Cr16.4Al8.6合金粗化过程标度行为的微观相场研究

Microscopic Phase-Field Simulation for Scaling Behavior of Ni75Cr16.4Al8.6 Alloy during Coarsening Process

摘要:

基于微观相场模型，研究Ni75Cr16.4Al8.6的粗化后期演化过程。结果表明：L12相和DO22相的标度函数曲线图表明合金沉淀在粗化阶段均表现出标度行为，不加应变能时DO22相结构函数因子和标度函数峰值均大于L12相；加入应变能后，两相的结构函数因子和标度函数的峰值均变小，反映了应变能对两相沉淀粗化过程的阻碍影响；相对于L12相，DO22相减小幅度更大，L12相结构函数因子和标度函数峰值大于DO22相，应变能对DO22相的阻碍作用更大。

Abstract:

Based on the microscopic phase-field kinetic model, the evolution of Ni75Cr16.4Al8.6 alloy in the later stage of coarsening was studied using the structure function normalized factor and scaling function. The simulation results show that both the curves of scaling function of L12 phase and DO22 phase present scaling behavior in the coarsening process. Without elastic strain energy, the peak values of structure function normalized factor and scaling function of DO22 phase are higher than that of L12 phase. When the elastic strain energy is added, the curve peaks of both phases become smaller. It means the growth of both phases are stunted by strain energy; compared with L12 phase, the decrease extent of DO22 phase is larger; peak values of structure function factor and scaling function of L12 phase are higher than that of DO22 phase. The strain energy plays a greater role of restriction on DO22 phase.