Macrosegregation driven by movement of minor phase in (Al0.345Bi0.655)90Sn10 immiscible alloy
Macrosegregation driven by movement of minor phase in (Al0.345Bi0.655)90Sn10 immiscible alloy
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DOI：
10.1007/s00339-014-8654-2
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发表时间：
2014-08
期刊：
影响因子：
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通讯作者：
W. Q. Lu;S. Zhang;J. G. Li
中科院分区：
文献类型：
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作者：
W. Q. Lu;S. Zhang;J. G. Li
通过将熔体喷射到硅油中，研究了(Al0.345Bi0.655)90Sn10(质量％，下同)难混溶合金宏观偏析结构的形成。弥散合金球中获得了两种典型的宏观偏析结构：核/壳结构和新月形结构。根据合金球内部估计的温度场，计算了富Bi小液滴的热马兰戈尼、溶质马兰戈尼和斯托克斯运动的速度。分析表明，表面偏析、Soret效应、热Marangoni运动、溶液Marangoni运动和Stokes运动在Al/Bi-Sn核/壳结构的形成中起着关键作用。当富Bi小液滴半径小于临界值时，液态合金球凝固，形成Al/Bi-Sn核壳结构；当富Bi小液滴半径超过临界值时，液态合金球凝固，形成新月形结构。
Formation of macrosegregation structure in (Al0.345Bi0.655)90Sn10(mass percent, the same below) immiscible alloy was investigated by spraying its melt into silicone oil. Two kinds of typical macrosegregation structures were obtained in the dispersed alloy spheres: core/shell structure and crescent structure. Based on the estimated temperature field inside the alloy spheres, the velocities of thermal Marangoni, solutal Marangoni, and Stokes motions of the Bi-rich minor droplets were calculated. Analysis shows that surface segregation, Soret effect, thermal Marangoni motion, solutal Marangoni motion, and Stokes motion play a key role in the formation of Al/Bi–Sn core/shell structure. If the liquid alloy spheres solidify on the condition that the radius of the Bi-rich minor droplets is smaller than a critical value, it will form Al/Bi–Sn core/shell structure, while the crescent structure will be formed when the liquid alloy spheres frozen on the condition that the radius of the Bi-rich minor droplets exceeds the critical value.