Effects of Magnetic Field on the Microstructure in Zinc Alloy during Directional Solidification

Gao Zhiyu; Dai Qingjiang; Huang Liguo

doi:10.15980/j.tzzz.2013.07.016

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Effects of Magnetic Field on the Microstructure in Zinc Alloy during Directional Solidification
Vol. 33, Issue 7, Pages: 676-679(2013)
Published： 2013 ，
DOI： 10.15980/j.tzzz.2013.07.016

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[1]高志玉,代清江,黄立国.磁场对锌合金定向凝固显微组织的影响[J].特种铸造及有色合金,2013,33(07):676-679.

Gao Zhiyu, Dai Qingjiang, Huang Liguo. Effects of Magnetic Field on the Microstructure in Zinc Alloy during Directional Solidification. [J]. Special Casting & Nonferrous Alloys 33(7):676-679(2013)
[1]高志玉,代清江,黄立国.磁场对锌合金定向凝固显微组织的影响[J].特种铸造及有色合金,2013,33(07):676-679. DOI： 10.15980/j.tzzz.2013.07.016.

Gao Zhiyu, Dai Qingjiang, Huang Liguo. Effects of Magnetic Field on the Microstructure in Zinc Alloy during Directional Solidification. [J]. Special Casting & Nonferrous Alloys 33(7):676-679(2013) DOI： 10.15980/j.tzzz.2013.07.016.

摘要

基于改进的自制Bridgman水平卧式定向凝固装置

研究了横向直流稳恒磁场对Zn-35Al-2.5Cu-1.5Ti合金显微组织的影响。通过金相显微组织观察、显微组织定量表征等方式

分析了磁场对锌合金显微组织的影响规律。结果表明

随着磁感应强度增加

因磁场存在而产生的热电磁流体动力学（TEMHD）效应增强

促进液-固界面糊状区熔体流动

有利于原子扩散迁移

显微组织粗化;牵引速度增加

TEMHD效应减弱

凝固组织细化。当磁感应强度为0.2T

定向凝固牵引速率为30μm/s时

锌合金显微组织粗化严重。施加磁场与未施加磁场的合金显微组织相比

其一次臂、二次臂间距增加最大幅度可达44.9%和52.2%。

Abstract

Influences of transverse DC static magnetic field on microstructure of Zn-35Al-2.5Cu-1.5Ti alloy were investigated by modified self-developed horizontal Bridgman directional solidification device. Influences of the magnetic field on the microstructure of the zinc alloy were investigated by observing the microstructure and its quantitative characterization. The results show that with increasing in magnetic induction intensity

the microstructure in the directional solidified Zn alloy is coarsened

which is attributed to the Thermo-Electric MagnetoHydroDynamic （TEMHD） effect generated from the presence of a magnetic field promoting the melt flow in the liquid-solid interface mushy zone and atomic migration. With increasing in drawing velocity

the microstructure is refined as a result of fading of TEMHD. The microstructure in zinc alloy becomes coarse seriously with the magnetic induction intensity of 0.2 T and drawing velocity of 30 μm/s. Compared with the absence of magnetic field

the first arm and the second arm spacing are increased by 44.9% and by 52.2%

respectively.