Liquid-phase Separation in Rapid Solidification of Undercooled Fe-Co-Cu Melts

• Published in: Journal of materials science & technology 2012-07, Vol.28 (7), p.622-625
• Main Authors: Liu, Ning, Liu, Feng, Chen, Zheng, Yang, Gencang, Yang, Changlin, Zhou, Yaohe
• Format: Article
• Language: English
• Subjects: Alloys; Boundaries; Co-Cu合金; Differential thermal analysis; Droplets; Egg-type structure; Iron; Liquid-phase separation; Liquids; Melts; Separation; Undercooled Fe-Co-Cu alloys; 冷铁; 凝固温度; 差示热分析; 快速凝固; 液体分离; 液相分离; 铜熔体
• ISSN: 1005-0302; 1941-1162
• DOI: 10.1016/S1005-0302(12)60107-8

The homogeneous liquid was separated into two phases, （Fe, Co）-rich LI and Cu-rich L2, once the melt was undercooled below a liquid-phase separation temperature Tsep. If the duration from Tsep to Tsl （solidification temperature of LI phase）, termed the liquid-phase separation interval Δt, exceeded a critical value, an eggtype structure was observed. By utilizing differential thermal analyses （DTA）, the solidification process of the undercooled Fe-Co-Cu alloys was studied. Additionally, an immiscible boundary was obtained, which was a convex parabola with a symmetrical axis of XCu=0.52. Depending on the relative amounts of LI and L2, the minor phase was nucleated firstly to form liquid droplets and separated from the original liquids at the beginning of liquid-phase separation.