中文摘要：

采用Al-（3．4—15）％Bi（质量分数）难混溶合金进行了快速连续凝固实验，研究了Bi含量和凝固速率对快速连续凝固组织的影响．结果表明，少量富Bi相粒子尺寸随着Bi含量的增加而增大，提高凝固速率有助于制备少量富Bi相粒子均匀分布的难混溶合金．通过分析富Bi粒子尺寸分布，发现沿试样轴向和径向方向粒子平均直径变化不大，试样表层处粒子尺寸较小．研究表明，快速连续凝固是制备均质难混溶合金的有效途径．

英文摘要：

The experiment of rapid continuous solidification of Al-Bi immiscible alloys with composition ranged from 3.4% to 15% （mass fraction） Bi has been carried out. The influences of the Bi content and the casting rate on the microstructure evolution during the rapid continuous solidification have been investigated. It has been indicated that the average size of the Bi-rich particles increases with the increase of the Bi content. Increasing the casting rate is in favor of the preparation of immiscible alloy with dispersed microstructure. The size distribution of the Bi-rich particles has been analyzed, and it was shown that the size variation of the Bi-rich particles along the axial and radial directions of the sample is not distinct, while on the sample surface the particle size is relative small. It is indicated that the rapid continuous solidification is a potential technique to be used in the manufacturing of immiscible alloy.