超声及电磁场场对亚共晶铝硅合金凝固组织的影响（英文）

Effect of ultrasonic and electromagnetic fields on solidification structure of hypoeutectic Al-Si alloy

本文研究了4004铝合金在不同物理场作用下初生α-Al和共晶硅的形貌特征.不同物理场主要包括超声场、电磁场、超声和电磁复合场.实验结果表明,单独应用超声或电磁场情况下,铸锭的凝固组织都达到了细化效果.特别是功率超声场,可以细化铝合金中的共晶硅相.当施加超声和电磁复合场时,初生α-Al相和共晶硅相都得到细化,细化程度与同等条件下施加功率超声场的细化效果几乎等同,但是,复合场处理的铸锭细化区域明显得到扩大.

The morphology of primary α-Al and eutectic silicon in 4004 aluminum alloy under diverse physical fields was investigated.The diverse physical fields are ultrasonic（UST） or electromagnetic（EMS）,and their compound（UE）.The results showed that the solidification structures of ingots could be refined by using UST or EMS solely.In particular,the high-intensity ultrasonic vibration had a significant effect on refining eutectic silicon phase.When the compound field was imposed,both the primary aluminum phase and the eutectic silicon phase were refined,the refinement effect is nearly uniform with the samples treated by power ultrasonic solely,however,the refinement zone in compound field would be larger than sole UST or EMS.