稳恒电场对铝合金初生α-Al的细化研究

张永; 丁宏升; 刘军; 孟凡奇; 刘洪汇

doi:10.15980/j.tzzz.2013.03.010

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稳恒电场对铝合金初生α-Al的细化研究
Refinement Effects of Steady Electric Field on Primary α-Al in Solidification Microstructures of Aluminum Alloys
2013年33卷第3期页码：197-200
纸质出版日期： 2013 ，
DOI： 10.15980/j.tzzz.2013.03.010

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[1]张永,丁宏升,刘军,孟凡奇,刘洪汇.稳恒电场对铝合金初生α-Al的细化研究[J].特种铸造及有色合金,2013,33(03):197-200.

Refinement Effects of Steady Electric Field on Primary α-Al in Solidification Microstructures of Aluminum Alloys[J]. Special Casting & Nonferrous Alloys, 2013,33(3):197-200.
[1]张永,丁宏升,刘军,孟凡奇,刘洪汇.稳恒电场对铝合金初生α-Al的细化研究[J].特种铸造及有色合金,2013,33(03):197-200. DOI： 10.15980/j.tzzz.2013.03.010.

Refinement Effects of Steady Electric Field on Primary α-Al in Solidification Microstructures of Aluminum Alloys[J]. Special Casting & Nonferrous Alloys, 2013,33(3):197-200. DOI： 10.15980/j.tzzz.2013.03.010.

摘要

通过将稳恒电场作用于固相线以上糊状区和液相区内的Al-9Si合金

研究电场对铝合金凝固组织中初生α-Al形态、尺寸的影响规律。利用XJY-160巡检仪对合金降温凝固过程进行温度测量

同时借助光学显微镜（OM）和图像分析软件Image pro plus对Al-9Si合金进行组织分析。结果表明

随着所加载的电流密度的增大

初生α-Al晶粒尺寸先快速降低而后缓慢降低

电流密度最大值为330mA·mm-2。稳恒电场的Pinch效应和热电磁流体（TEMHD）效应阻止了初生α-Al树枝晶向发达趋势生长。

Abstract

Through exerting a steady electric field on Al-9Si binary alloy in the mushy zone and liquid phase zone above liquidus

influence of electric field on the morphology and size of the primary α-Al in solidification microstructures of aluminum alloy was investigated.Temperature data during the cooling process of Al-9Si melt was measured and collected with temperature recording instrument XJY-160

and the solidification microstructure was analyzed by OM（optical microscope） and Image pro plus software.The results show that with the increase of current density

the size of primary α grains are decreased first rapidly and then slowly under a steady electric field

and critical current density is 330 mA·mm-2.Both the Pinch effect and thermoelectric magnetohydrodynamic（TEMHD） caused by steady electric field are responsible for restraining dendirtic growth of the primary α-Al grains in the Al-9Si alloy.