Solute redistribution profiles during rapid solidification of undercooled ternary Co-Cu-Pb alloy
Solute redistribution profiles during rapid solidification of undercooled ternary Co-Cu-Pb alloy
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DOI：
10.1007/s11433-013-5389-6
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发表时间：
2014-01
期刊：
影响因子：
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通讯作者：
N. Yan;Wei-li Wang;Zhenchao Xia;B. Wei
中科院分区：
文献类型：
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作者：
N. Yan;Wei-li Wang;Zhenchao Xia;B. Wei
用玻璃助熔剂法研究了液态Co-35%Cu-32.5%Pb三元不混溶合金的溶质再分配和相分离。实现了125 K的整体过冷度，宏观偏析模式的特征在于顶部富Co区和底部富Cu区。除富Cu区的溶质Pb含量较高外，两个分离区的平均溶质含量均随过冷度的增加而降低。随着过冷度的增加，富Co区初生α（Co）相由枝晶向等轴晶转变。Cu在初生α（Co）相中的溶质再分配与过冷度和富Co区成分有关。斯托克斯迁移是液相分离过程中液滴运动的主要动力学机制。
The solute redistribution and phase separation of liquid ternary Co-35%Cu-32.5%Pb immiscible alloy have been investigated using glass fluxing method. A bulk undercooling of 125 K was achieved and the macrosegregation pattern was characterized by a top Co-rich zone and a bottom Cu-rich zone. The average solute contents of the two separated zones decreased with the increase of undercooling, except for the solute Pb in Cu-rich zone. With the enhancement of undercooling, a morphological transition from dendrites into equaxied grains occurred to the primary α(Co) phase in Co-rich zone. The solute redistribution of Cu in primary α(Co) phase was found to depend upon both the undercooling and composition of Co-rich zone. Stokes migration is shown to be the main dynamic mechanism of droplet movement during liquid phase separation.