Microstructure Evolution of Hypoeutectic Al-Si alloy with Electromagnetic Stirring and Ultrasonic Treatment

摘要：

　　Effects of electromagnetic stirring(EMS),ultrasonic treatment(UST)and the combination of EMS and UST(EU)on solidification structure were investigated in hypoeutectic Al-Si alloy.The results indicate that EMS,UST and EU can refine primary α-Al and modify eutectic silicon by influencing their nucleation and growth processes.EMS can fracture the dendrite arms and lead to decrease of primary α-Al grain size.It also changes the morphology of eutectic silicon and widens the separation of silicon plates.For UST,the cavitation and acoustic streaming are the principal reasons for the microstructure refinement,which enhance the undercooled and heterogeneous nucleation.EU has combined the features of EMS and UST,hence obtains the best effect on the microstructure evolution.Significant refinement of primary α-Al and evident modification of eutectic silicon are observed with EU.In addition,the mechanism of morphological evolution with EU was preliminarily discussed.

关键词： electromagnetic stirring ultrasonic treatment Al-Si alloy microstructure

作者: ZHANG Yu-bo FU Ying WANG Tong-min CAO Zhi-qiang LI Ting-ju

作者单位: School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,Liaoning,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: 1-5

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）