Evolution of dendrite morphology of a binary alloy under an applied electric current: an in situ observation.
Evolution of dendrite morphology of a binary alloy under an applied electric current: an in situ observation.
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DOI：
10.1103/physreve.81.042601
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发表时间：
2010-04
期刊：
影响因子：
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通讯作者：
Tongmin Wang;J. Xu;T. Xiao;Honglan Xie;Jun Li;Tingju Li;Z. Cao
中科院分区：
文献类型：
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作者：
Tongmin Wang;J. Xu;T. Xiao;Honglan Xie;Jun Li;Tingju Li;Z. Cao
采用同步辐射成像技术原位观察了直流电场作用下Sn-Bi二元合金凝固过程中的枝晶生长。施加7 ~ 32 a /cm2电流抑制枝晶分支，枝晶尖端呈圆形或扁平状，未发现三级枝晶。随着直流密度的增加，树突形态由柱状树突转变为等轴细胞状树突再转变为等轴树突。特别是，初生枝晶在高强度直流电流下以尖裂方式分支。讨论了直流对枝晶形态演变的影响。
Synchrotron radiation imaging technique was used to in situ observe the dendrite growth of a solidifying Sn-Bi binary alloy under a direct current (dc) electric field. By applying a dc (7-32 A/cm2), the dendrite branching was suppressed, the dendrite tip was modified to be round or flat, and no tertiary dendrite was found. With increasing dc density, the dendrite morphology was changed from columnar dendritic to equiaxed cellular to equiaxed dendritic. In particular, the primary dendrite branched following a tip-split manner in a higher intensity dc. The influence of dc on the evolution of dendrite morphology was discussed.