中文摘要：

研究了不同抽拉速率对含Ru镍基单晶高温合金凝固组织的影响。结果表明，随着抽拉速率的加快，单晶合金的铸态组织由粗枝状晶向细枝状晶演变，枝晶干和枝晶间的γ′相尺寸减少，合金元素的偏析降低，γ-γ′共晶含量减少，NiAl基β含量逐渐降低。同时，抽拉速率对合金的相变温度影响不大。

英文摘要：

The effect of withdrawal rates on the solidification microstructure of a single crystal Ni-based superalloy containing ruthenium was investigated. The results show that with the increase of the withdrawal rate, the as-cast microstructure of the single crystal alloy transforms from coarse dendrite to fine dendrite. Meanwhile, the size of the γ′ particles decreases, segregation of alloying elements for the dendrite and interdendritic regions tends to be reduced, the volume fraction of γ-γ′ eutectic and NiAl-based β phase decreases gradually. In addition, the withdrawal rate has little influence on the phase transformation temperature of the superalloy