Solidification Behavior of Immiscible Alloys under the Effect of a Direct Current

被引：0

作者：

Hongxiang Jiang ^{[1
]}

Jiuzhou Zhao ^{[1
]}

Jie He ^{[1
]}

机构：

[1] Institute of Metal Research,Chinese Academy of Sciences

来源：

JournalofMaterialsScience&Technology | 2014年 / 30卷 / 10期

基金：

中国国家自然科学基金;

关键词：

Rapid directional solidification; Direct current; Finely dispersed microstructure; Shell/core structure;

D O I：

暂无

中图分类号：

TG111.4 [金属的液体结构和凝固理论]; TG146.21 [];

学科分类号：

0702 ; 070205 ; 080502 ;

摘要：

Directional solidification experiments were carried out with Al—Pb alloys under the effect of a direct current(DC).The experimental results show that the DC causes a migration of the minority phase droplets(MPDs) from the middle part to the surface region of the sample.Samples with either a finely dispersed microstructure or a shell/core structure were obtained by solidifying the alloy under the effect of the properly selected DC densities.A model was developed to describe the microstructure evolution in an immiscible alloy directionally solidified under the effect of the DC.The microstructure formation in the Al—Pb alloys was calculated.The numerical results are in favorable agreement with the experimental ones.They demonstrate that the DC affects the microstructure formation mainly through changing the spatial motions of the MPDs and the temperature field of the melt in front of the solid/liquid interface.The formation mechanisms of the finely dispersed microstructure as well as the shell/core structure were sufficiently clarified.

引用

页码：1027 / 1035

页数：9

共 23 条

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