Evolution of dendrite morphology of a binary alloy under an applied electric current: an in situ observation.
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.
Wang
Tongmin
T
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116023, China.
Xu
Jingjing
J
Xiao
Tiqiao
T
Xie
Honglan
H
Li
Jun
J
Li
Tingju
T
Cao
Zhiqiang
Z