Effects of Rotating Magnetic Field on Microstructure of Sn-Bi Alloy

Zhu Jianhua; Chen Changle; Chen Zhao

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Effects of Rotating Magnetic Field on Microstructure of Sn-Bi Alloy
Issue 6, Pages: 453-456(2008)
Published： 2008 ，
DOI：

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[1]朱建华,陈长乐,陈钊.旋转磁场对Sn-Bi合金凝固组织的影响[J].特种铸造及有色合金,2008(06):453-456+408.

Zhu Jianhua, Chen Changle, Chen Zhao. Effects of Rotating Magnetic Field on Microstructure of Sn-Bi Alloy. [J]. Special Casting & Nonferrous Alloys (6):453-456(2008)
[1]朱建华,陈长乐,陈钊.旋转磁场对Sn-Bi合金凝固组织的影响[J].特种铸造及有色合金,2008(06):453-456+408. DOI：

Zhu Jianhua, Chen Changle, Chen Zhao. Effects of Rotating Magnetic Field on Microstructure of Sn-Bi Alloy. [J]. Special Casting & Nonferrous Alloys (6):453-456(2008) DOI：

摘要

研究了Sn-Bi合金在不同凝固阶段施加旋转磁场对凝固组织的影响

分析了旋转磁场对各凝固组织的影响规律及细化作用。试验结果表明

对于Sn-55Bi亚共晶合金

旋转磁场对组织的影响主要是在初生相生成时产生的

所以β相处理效果接近于全程处理

初生Sn相被球化

呈颗粒状均匀分布在基体上;对于常规条件下重力偏析严重的Sn-65Bi过共晶合金

某个阶段的处理不能消除重力偏析

只有全程处理才能完全消除偏析

得到分布均匀的组织。

Abstract

Effects of rotating magnetic field on solidified structure of Sn-Bi alloy have been observed based on applying field at different solidified stages.The experimental results reveal that creation of primary phase in Sn-55Bi hypoeutectic alloy is controlled by rotating magnetic field

in which the spheroidized primary Sn phase is uniformly distributed in the matrix.The microstructure with uniform distribution of Sn-65Bi hypereutectic alloy can be observed only with applying rotating magnetic field at the whole solidification process.