Effect of electromagnetic field on the behavior and distribution of the particles in front of metallic solidification interface
电磁场对金属凝固界面前沿颗粒行为及分布的影响

The quantitative relationship between the nonmetallic particle's redistribution in metal and electromagnetic force (EMF) was developed during the process of unidirectional solidification in electromagnetic field. It was pointed theoretically that controlling the cycle of the electromagnetic field and the solidified parameters could produce a new composite material in which the content of the particles is a function of the unidistance from the growing interface. Experimental results show that by applying periodical electromagnetic force to the unidirectionally solidified hypereutectic Al-19%Si alloy, the primary silicon-rich particles distributed layer by layer, and the surface hardness fluctuated periodically. Through adjusting the frequency of the electromagnetic force and the rate of the solidifying interface, the width between the two adjacent layers could be changed freely.