本文用具有宽结晶间隔的Al—Cu合金在非平衡的稳态条件下进行定向凝固试验。观察了溶质再分布特性、固/液界而形态和定向凝固过程,通常均应认为是界面前沿液体中的温度梯度和晶体生长速率的比值的函数。结果表明,平面界面生长所需的G/R比值比枝晶生长所需的约高10~3倍。 In this paper, Al-Cu alloys with a wide crystal spacing were used to conduct directional solidification experiments under non-equilibrium steady-state conditions. Solute redistribution, solid / liquid boundary morphology, and directional solidification are observed and should generally be considered as a function of the ratio of the temperature gradient to the crystal growth rate in the interfacial liquid. The results show that the G / R ratio required for planar interface growth is about 10 to 3 times higher than that required for dendrite growth.