Rapid solidification and dendrite growth of ternary Fe-Sn-Ge and Cu-Pb-Ge monotectic alloys |
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Authors: | Zhang XueHua Ruan Ying Wang WeiLi Wei BingBo |
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Institution: | Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, China |
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Abstract: | The phase separation and dendrite growth characteristics of ternary Fe-43.9%Sn-10%Ge and Cu-35.5%Pb-5%Ge monotectic alloys
were studied systematically by the glass fluxing method under substantial undercooling conditions. The maximum undercoolings
obtained in this work are 245 and 257 K, respectively, for these two alloys. All of the solidified samples exhibit serious
macrosegregation, indicating that the homogenous alloy melt is separated into two liquid phases prior to rapid solidification.
The solidification structures consist of four phases including α-Fe, (Sn), FeSn and FeSn2 in Fe-43.9%Sn-10%Ge ternary alloy, whereas only (Cu) and (Pb) solid solution phases in Cu-35.5%Pb-5%Ge alloy under different
undercoolings. In the process of rapid monotectic solidification, α-Fe and (Cu) phases grow in a dendritic mode, and the transition “dendrite→monotectic cell” happens when alloy undercoolings
become sufficiently large. The dendrite growth velocities of α-Fe and (Cu) phases are found to increase with undercooling according to an exponential relation.
Supported by the National Natural Science Foundation of China (Grant Nos. 50121101 and 50395105) and the Doctorate Foundation
of Northwestern Polytechnical University of China (Grant No. CX 200419) |
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Keywords: | phase separation dendrite growth monotectic alloy undercooling macrosegregation |
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