针对目前提升镁合金电磁屏蔽性能主要局限于通过提高合金导电性的现状，本项目提出通过提升合金导电性、增加电磁反射界面、引入磁性材料三种途径，获得宽频段高电磁屏蔽性能的镁锂基复合材料。. 项目提出以双相镁锂合金作研究对象，设计和制备含大量含稀土析出相和LPSO结构的镁锂合金，同时引入铁氧体，对其进行累积叠轧加工，实现累积叠轧－固态复合一体化加工。综合利用时效析出导致的电导率提升、细晶化产生的大量晶界、双相镁锂合金基体的相界、基体与析出相的相界、叠层间的界面、LPSO的层状结构、含稀土析出相与LPSO的磁性能以及铁氧体的磁性能等提升电磁屏蔽性能的有利因素。研究以上各因素对于镁锂基复合材料电磁屏蔽性能的作用行为，各种因素在发挥电磁屏蔽效能作用中的排序以及各因素之间的协同作用机理。

Presently, the research about electromagnetic shielding of Mg alloys mainly focuses on the improvement of electron conductivity. Research proposal is put forwards in this project to obtain Mg-Li matrix composite with good electromagnetic property in a wide frequency through three ways of increasing electron conductivity, increasing reflecting interface and introducing magnetic materials.. In this project, Mg-Li alloy with duplex phases is chosen as research subject. The alloy with many precipitates containing RE and LPSO structure will be prepared. Ferrite will be also introduced into the alloy with accumulative roll bonding to obtain composite materials. The beneficial factors of improvement of electron conductivity due to aging precipitation, huge grain boundary due to refinement, phase boundary between alfa(Mg) and beta(Li), phase boundary between matrix and precipitates, interface between laminates, the magnetic property of precipitates containing RE, LPSO and ferrite are comprehensively considered and combined to fabricate an ideal material. The effects of these factors on the electromagnetic property will be studied. The influence sequence of these factors and the synergy effects of them will be also researched.