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。
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