Microstructural Evolution of Rapidly Solidified Co-Mo and Ni-Mo Eutectic Alloys  

作　　者：Xiujun HAN, Wenjing YAO and Bingbo WEDepartment of Applied Physics, Northwestern Polytechnical University, Xi’an 710072, China 

出　　处：《Journal of Materials Science & Technology》2003年第6期553-556,共4页材料科学技术（英文版）

基　　金：This work is financially supported by the National Natural Science Foundation of China(Grant No.s 50101010,59901009,50221101 and 50201013);Doctorate Foundation of Northwestern Polytechnical University(Grant No.200243).

摘　　要： Droplets of Co-37.6 wt pct Mo and Ni-47.7 wt pct Mo eutectic alloys were rapidly solidified during containerless processing in a 3 m drop tube. A kind of anomalous eutectic appears in these two eutectic alloys when undercooling is beyond 56 and 61 K, respectively. The two eutectic phases in anomalous eutectic were observed to grow in dendrite manner. The formation of anomalous eutectic is ascribed to the cooperative dendrite growth of the two independently nucleated eutectic phases. Current dendrite and eutectic growth theories are applied to describe the observed processes.Droplets of Co-37.6 wt pct Mo and Ni-47.7 wt pct Mo eutectic alloys were rapidly solidified during containerless processing in a 3 m drop tube. A kind of anomalous eutectic appears in these two eutectic alloys when undercooling is beyond 56 and 61 K, respectively. The two eutectic phases in anomalous eutectic were observed to grow in dendrite manner. The formation of anomalous eutectic is ascribed to the cooperative dendrite growth of the two independently nucleated eutectic phases. Current dendrite and eutectic growth theories are applied to describe the observed processes.

关 键 词：Rapid solidification Eutectic growth Dendrite growth Containerless processing 

分 类 号：TG111.4[金属学及工艺—物理冶金]