利用连续波CO2 激光器对Cu 31 4 %Mn进行了系列表面熔凝实验 ,对该合金的组织形态和胞晶间距选择规律进行了研究 .结果表明 :随着生长速度的提高 ,组织形态由低速平界面向展宽胞晶、规则胞晶、展宽胞晶、类平面晶和高速绝对稳定平界面转变 .在快速凝固条件下 ,Cu 31 4 %Mn合金的胞晶间距存在一个选择范围 ,最大、最小和平均胞晶间距与生长速度的关系分别为λmax=6 82v- 0 33s ,λmin=2 89v- 0 2 8s 和 λ =4 35v- 0 31s ,实验结果与Hunt Lu模型的预测结果相吻合 . A series of surface melting experiments were carried out on the Cu 31 4% Mn by continuous wave CO2 laser to study the rules of the morphology and cell spacing of Cu 31 4% Mn.The results show that with the increase of the growth rate, The interface of Cu 31 4% Mn alloy has a wide selection of range, maximum and minimum, and the maximum and the minimum of intergranular spacing in the case of rapid solidification The relationship between the average cell spacing and the growth rate is λmax = 6 82v-0 33s, λmin = 2 89v-0 28s and λ = 4 35v-0 31s, respectively. The experimental results are in good agreement with the predictions of Hunt Lu model.