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利用相场模型与溶质场、温度场进行耦合计算,以Ni-40.83%Cu合金为例模拟了二元合金枝晶生长过程.系统研究相场模型中相场和温度场耦合强度对枝晶形貌和浓度分布的影响.模拟结果表明:随着耦合强度的增加,相场受温度场的影响加大,界面前沿变得不稳,扰动被放大,主枝上出现了二次枝晶.同时,枝晶尖端的生长速率增大,而枝晶尖端的曲率半径减小,枝晶前沿的溶质富集现象也更严重;另外,计算结果与Ivantsov理论符合较好.
Phase-field model was used to simulate the binary alloy dendrite growth by coupling with the solute field and the temperature field.The phase-field model was used to simulate the growth of binary alloy dendrites.Simulation results showed that the coupling strength between phase field and temperature field The results show that with the increase of the coupling strength, the phase field is more affected by the temperature field, the front of the interface becomes unstable, the disturbance is amplified, and the secondary dendrites appear on the main branch. , The growth rate of dendrite tip increases, while the radius of curvature of the dendrite tip decreases, and the solute enrichment at the front of the dendrite becomes more serious. In addition, the calculated results are in good agreement with Ivantsov’s theory.