Core-shell microstructure formed in the ternary Fe-Co-Cu peritectic alloy droplet |
| |
Authors: | FuPing Dai BingBo Wei |
| |
Institution: | (1) Department of Applied Physics, Northwestern Polytechnical University, Xi’an, 710072, China |
| |
Abstract: | The metastable liquid phase separation occurs in the ternary Cu50Fe37.5Co12.5 peritectic alloy droplets during free fall. The separated alloy melt rapidly solidifies and evolves core-shell microstructure
composed of L1(Cu) and L2(Fe,Co) phases. Based on the determination of the phase transition temperature, the core-shell microstructure evolution, the
interfacial energy, the temperature gradient and the Marangoni migration are analyzed. The interfacial energy of the separated
liquid phase increases with the decrease of the temperature. The temperature gradient changes from large to small along the
radius direction from inside to outside in the alloy droplet. The Marangoni force (F
M) acting on the micro-droplet of L2(Fe,Co) phase increases with the increase of the size of the L2(Fe,Co) phase, and decreases with the increase of undercooling. Driven by F
M, the micro-droplet of L2(Fe,Co) phase migrates from outside to inside in the alloy droplet, collides and coagulates each other during migration, and
then forms different types of core-shell microstructures.
Supported by the National Natural Science Foundation of China (Grant Nos. 50121101, 50395105) and NPU Youth Scientific and
Technological Innovation Foundation (Grant No. W016223) |
| |
Keywords: | ternary peritectic liquid phase separation reduced gravity core-shell microstructure |
本文献已被 CNKI SpringerLink 等数据库收录! |
| 点击此处可从《中国科学通报(英文版)》浏览原始摘要信息 |
| 点击此处可从《中国科学通报(英文版)》下载免费的PDF全文 |
|