探讨了电磁场耦合定向凝固过程中非金属颗粒在金属中的分布与 电磁力的定量关系. 从理论上指出, 控制电磁力周期及凝固参数 可制备出颗粒浓度与金属生长距离呈函数关系的新型复合材料. 采用过共 晶Al-19%Si合金的定向凝固实验结果表明, 通过周期性地施加电磁力, 合金中的初晶富Si颗粒呈层状分 布, 表面硬度也呈周期变化. 通过改变电磁力施加周期和凝固速率, 可以自由改变富Si层之间的宽度.
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.
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