Effect of traveling magnetic field on solute distribution and dendritic growth in unidirectionally solidifying Sn-50 wt%Pb alloy: An in situ observation

被引：18
作者：
Cao, Fei [1 ]
Yang, Fenfen [1 ]
Kang, Huijun [1 ]
Zou, Cunlei [1 ]
Xiao, Tiqiao [2 ]
Huang, Wanxia [3 ]
Wang, Tongmin [1 ]
机构：
[1] Dalian Univ Technol, Key Lab Solidificat Control & Digital Preparat Te, Sch Mat Sci & Engn, Dalian 116024, Peoples R China
[2] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201204, Peoples R China
[3] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
来源：
JOURNAL OF CRYSTAL GROWTH | 2016年 / 450卷
基金：
中国国家自然科学基金;
关键词：
Directional solidification; Convection; Traveling magnetic field; Synchrotron X-ray radiography; Dendritic growth; Sn-Pb alloy; X-RAY RADIOGRAPHY; DIRECTIONAL SOLIDIFICATION; MELT CONVECTION; NI-ALLOYS; MICROSTRUCTURE; FRAGMENTATION; STATE; PCT;
D O I：
10.1016/j.jcrysgro.2016.06.034
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
Synchrotron X-ray radiography was used to in situ study the solute distribution and the dendritic growth during the bottom-up solidification of Sn-50 wt%Pb alloy under a traveling magnetic field (TMF) for the first time. The buoyance driven evolution and motion of the plumes containing Sn-rich melt are directly observed in the solidification front before the application of TMF. A forced melt flow from left to right is induced with the application of TMF, which results in the redistribution of the solute concentration (facilitate the solute transportation and reduce the local fluctuations considerably) and the change of the dendrite morphologies (promote/suppress the growth of the secondary arms, remelting and fragmentation of dendrites). Meanwhile, the concentration variations of Sn around the solidification front are quantitatively analyzed through the extraction of gray level from sequenced X-ray images. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：91 / 95
页数：5
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