【摘要】 辐照诱导产生的点缺陷会加速核电站材料微观组织的演变，在很大程度上影响反应堆的寿命。本研究基于相场法的四元连续相场模型，耦合了空位和间隙原子，利用该模型模拟了Fe-15%Cu-1%Ni-1%Mn（原子分数）合金在空位扩散机制下的相分离，研究了点缺陷与富Cu相的相互作用机制。结果表明，空位和间隙原子会促进富Cu相的长大和粗化，点缺陷浓度的升高会促进相分离，加快析出相的失稳分解速率，并且升高温度会延缓Cu原子和空位环的生长和粗化，点缺陷也可以增加一定的屈服强度，为探究空位扩散机制影响抗辐照材料性能方面提供了新的思路。更多还原

【Abstract】 The irradiation-induced point defects accelerate the evolution of the microstructure of nuclear power plant materials and affect the reactor lifetime to a large extent. In this paper, based on the quadratic continuous phase field model of the phase field method with coupled vacancy and interstitial atoms, the phase separation of Fe-15at%Cu-1at%Ni-1at%Mn alloy under the vacancy diffusion mechanism was simulated, and the interaction mechanism between the point defects and the Cu-rich phase was investigated. The results show that the vacancy and interstitial atoms promote the growth and coarsening of the Cu-rich phase, the increase in the point defect concentration promotes the phase separation and accelerates the destabilization decomposition of the precipitated phase, and the increase in the temperature delays the growth and coarsening of Cu atoms and vacancy rings, and the point defects can also increase the yield strength to a certain extent. It provides a new idea to investigate the effect of the vacancy diffusion mechanism on the properties of irradiation-resistant materials.更多还原