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Phase separation and rapid solidification of liquid Cu_(60)Fe_(30)Co_(10) ternary peritectic alloy

查看全文 作　　者：DAI FuPing, CAO ChongDe & WEI BingBo Department of Applied Physics, Northwestern Polytechnical University, Xi’an 710072, China 高影响力作者 出　　处：《Science China(Physics,Mechanics & Astronomy)》索引2007年第50卷第4期,共10页高影响力期刊 基　　金：the National Natural Science Foundation of China (Grant Nos. 50121101 and 50395105);the Scientific and Technological Creative Foundation of Youth in Northwestern Polytechnical University of China (Grant No. W016223) 摘　　要：The metastable liquid phase separation and rapid solidification of Cu60Fe30Co10 ternary peritectic alloy were investigated by using the drop tube technique and the differential scanning calorimetry method. It was found that the critical temperature of metastable liquid phase separation in this alloy is 1623.5 K, and the two sepa- rated liquid phases solidify as Cu(Fe,Co) and Fe(Cu,Co) solid solutions, respec- tively. The undercooling and cooling rate of droplets processed in the drop tube increase with the decrease of their diameters. During the drop tube processing, the structural morphologies of undercooled droplets are strongly dependent on the cooling rate. With the increase of the cooling rate, Fe(Cu,Co) spheres are refined greatly and become uniformly dispersed in the Cu-rich matrix. The calculations of Marangoni migration velocity (VM) and Stokes motion velocity (VS) of Fe(Cu,Co) droplets indicated that Marangoni migration contributes more to the coarsening and congregation of the minor phase during free fall. At the same undercooling, the VM/VS ratio increases drastically as Fe(Cu,Co) droplet size decreases. On the other hand, a larger undercooling tends to increase the VM/VS value for Fe(Cu,Co) drop- lets with the same size. 关 键 词：TERNARY PERITECTIC alloy METASTABLE IMMISCIBILITY rapid solidification reduced gravity LIQUID phase separation
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