Effect of a High Magnetic Field on the Microstructure during Directionally Solidified Sn-20wt.%Pb Hypoeutectic Alloy

摘要：

　　The microstructures of Sn-20wt.%Pb hypoeutectic alloy directionally solidified under a longitudinal magnetic field were investigated.The results show that the application of a high magnetic field has a great influence on the morphology of primary β-Sn phase at a temperature gradient of GL=52K/cm.At a certain growth speed,with the increase of magnetic field intensity,the magnetic field causes the primary β-Sn phase irregular and to be deformed,further,the magnetic field promotes the columnar to equaixed transition(CET).Further,the thermoelectric magnetic force(TEMF)imposed on the dendrite under a high magnetic field has been calculated and the results show that the numerical magnitude of the TEMF during directional solidification under a 10T high magnetic field is about 104N/m3 and this force should be responsible for the occurrence of the CET in the Sn-Pb alloy.This may act as an experimental proof that the coupling of temperature gradient and high magnetic field will induce the occurrence of the CET in Sn-Pb alloy.Above phenomena may be attributed to the thermoelectric magnetic force(TEMF)in solid.

关键词： high magnetic field Pb-Sn hypoeutectic alloy directional solidification columnar-to-equiaxed transition

作者: DU Da-fan LI Xi Yves FAUTRELLE REN Zhong-ming LU Zhen-yuan YU Qing-chen

作者单位: Department of Materials Engineering,Shanghai University,200072 Shanghai,P.R.China SIMAP-EPM-Madylam/CNRS,Grenoble Institute of Technology,BP 75,38402 St.Martin dHeres Cedex,France

会议类型: 国际会议

会议名称: The 7th International Conference on Electromagnetic Processing of Materials(第七届冶金与材料电磁过程国际大会)

会议地点: 北京

会议语种:英文

页码: 1-7

在线出版日期: 2012-10-22（万方平台首次上网日期，不代表论文的发表时间）