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

作　　者：Ning Liu Feng Liu Zheng Chen Gencang Yang Changlin Yang Yaohe Zhou 

机构地区：[1]School of Metallurgy and Materials Engineering, Jiangsu University of Science and Technology, Zhangjiagang 215600, China [2]State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xilan 710072, China [3]School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221008, China

出　　处：《Journal of Materials Science & Technology》2012年第7期622-625,共4页材料科学技术（英文版）

基　　金：supported by the Natural Science Foundation of China (Grant No.50771084);the Natural Science Foundation of the Education Department of Jiangsu province,China (Grant No.09KJB430004)

摘　　要：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.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.

关 键 词：Undercooled Fe-Co-Cu alloys Egg-type structure Liquid-phase separation 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TQ174.43[金属学及工艺—金属材料]