CAJ | 학술논문

基于熵函数建立二元合金的二维相场模型，采用基于均匀网格的有限差分法求解相场和溶质场控制方程；为了避免时间步长的限定，采用交替隐式差分法(ADI)求解温度场控制方程。对 Ni?Cu 合金非等温凝固过程的部分特征进行模拟研究，对比分析二元合金等温/非等温凝固过程。模拟结果表明：非等温模型更能有效地模拟二元合金的实际凝固过程，并且随着热扩散系数的减小，非等温相场模型逐渐向等温相场模型回归。
기우적함수건립이원합금적이유상장모형，채용기우균균망격적유한차분법구해상장화용질장공제방정；위료피면시간보장적한정，채용교체은식차분법(ADI)구해온도장공제방정。대 Ni?Cu 합금비등온응고과정적부분특정진행모의연구，대비분석이원합금등온/비등온응고과정。모의결과표명：비등온모형경능유효지모의이원합금적실제응고과정，병차수착열확산계수적감소，비등온상장모형축점향등온상장모형회귀。
Based on the entropy function, a two-dimensional phase field model of binary alloys was established. Meanwhile, an explicit difference method with uniform grid was adopted to solve the phase field and solute field controlled equations. And the alternating direction implicit (ADI) algorithm for solving temperature field controlled equation was also employed to avoid the restriction of time step. Some characteristics of the Ni?Cu alloy were captured in the process of non-isothermal solidification, and the comparative analysis of the isothermal and the non-isothermal solidification was investigated. The simulation results indicate that the non-isothermal model is favorable to simulate the real solidification process of binary alloys, and when the thermal diffusivity decreases, the non-isothermal phase-field model is gradually consistent with the isothermal phase-field model.