Effect of Vertical High Magnetic Field on the Morphology of Solid-Liquid Interface during the Directional Solidification of Zn-2wt.%Bi Immiscible Alloy

被引:4
作者
Zhou, Bangfei [1 ,2 ,3 ]
Guo, Xianghui [1 ,2 ,3 ]
Lin, Wenhao [1 ,2 ,3 ]
Liu, Ying [1 ,2 ,3 ]
Guo, Yifeng [1 ,2 ,3 ]
Zheng, Tianxiang [1 ,2 ,3 ]
Zhong, Yunbo [1 ,2 ,3 ]
Wang, Hui [4 ]
Wang, Qiuliang [4 ]
机构
[1] Shanghai Univ, State Key Lab Adv Special Steel, Shanghai 200444, Peoples R China
[2] Shanghai Univ, Shanghai Key Lab Adv Ferromet, Shanghai 200444, Peoples R China
[3] Shanghai Univ, Sch Mat Sci & Engn, Shanghai 200444, Peoples R China
[4] Chinese Acad Sci Beijing, Inst Elect Engn, 6 Beiertiao, Beijing 100190, Peoples R China
基金
上海市自然科学基金; 中国博士后科学基金; 中国国家自然科学基金;
关键词
high magnetic field; immiscible alloy; solid-liquid interface; constitutional supercooling; BI MONOTECTIC ALLOYS; IN-SITU; MICROSTRUCTURAL EVOLUTION; TRANSITION; GROWTH; STABILITY;
D O I
10.3390/met12050875
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The morphology of the solid-liquid (S-L) interface is crucial for the directionally solidified microstructures of various alloys. This paper investigates the effect of vertical high magnetic field (VHMF) on the morphology evolution of the S-L interface and the solidified microstructure during the directional solidification of Zn-2wt.%Bi immiscible alloy. The results indicate that the morphology of the S-L interface is highly dependent on the VHMF, resulting in various solidified microstructures. When the growth rate was 1 mu m/s, the aligned droplets were formed directly at the disturbed S-L interface under a 1 T VHMF. However, the stability of the S-L interface was improved to form a stable Bi-rich fiber under a 5 T VHMF. When the growth rate was 5 mu m/s, the S-L interface was changed from cellular to dendritic to cellular again with increasing magnetic flux density. A theory regarding constitutional supercooling and efficient solute diffusion has been proposed to explain the S-L interface transition under the VHMF. The difference in the effective diffusion capacity of the solute originates from the thermoelectric magnetic effect and the magneto-hydrodynamic damping effect. The present work may initiate a new method to transform the solidified microstructures of immiscible alloys via an applied magnetic field during directional solidification.
引用
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页数:13
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