Microstructure Refinement of Mg-Gd-Y-Zr Alloy under Pulsed Magnetic Field

摘要：

　　The effects of pulsed magnetic field on the solidified microstructure of Mg-Gd-Y-Zr alloy were investigated.Fine uniform equiaxed grains are acquired in the whole ingot by the pulsed magnetic field treatment,and the average grain size of the as-cast Φ50mm and Φ100mm ingots is refined to 37μm and 47μm with the pulsed magnetic field.The macrosegregation of solute elements of Mg-Gd-Y-Zr alloy is also reduced by the pulsed magnetic field treatment.Structure refinement is due to the electromagnetic undercooling zone in front of the solid/liquid interface by the magnetic pressure,and reduction of temperature gradient by the vibration of melt resulted from the pulsed magnetic field.which increases the nucleation rate and prohibits dendrite growth.In addition,primary α-Mg dendrites break into fine crystals,resulting in a refined solidification structure of the magnesium alloys.The Joule heat effect induced in the melt also strengthens the grain refinement effect and the spheroidization of dendrite arms.

关键词： pulsed magnetic field solidified microstructure grain refinement Mg-Gd-Y-Zr alloy

作者: WANG Bin YANG Yuan-sheng

作者单位: College of Engineering,Zhejiang Normal University,Jinhua,China Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China

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: 1-6

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）