利用第二相调控镁合金电磁屏蔽性能的基础研究

In today's world, the electromagnetic pollution is increasingly serious, the development of high performance electromagnetic shielding materials is the key to realize the electromagnetic shielding. Magnesium alloy has a series of excellent performance, electromagnetic shielding materials, a kind of potential however, so far the research work at home and abroad based on electromagnetic shielding properties of magnesium alloy is very limited, the main affecting factors and control methods of electromagnetic shielding effectiveness of magnesium alloys are not very clear. This project proposes to realize the reasonablecontrol of the precipitates in magnesium alloys by the coupling effect of plastic deformation and aging heat treatment, and regulate and control the electromagnetic shielding effectiveness of magnesium alloys based on the inner relationship between the precipittate characteristics and electromagnetic shielding performance. Through the study of characteristics and evolution of microstructure and texture in magnesium alloys during the process of plastic deformation, to investigate the precipitation behavior of second phases in a particular crystal plane in the process of aging heat treatment, analyze crystal structure and interface structure of second phases, research the internal relationship between the electromagnetic shielding properties of magnesium alloys and second phase characteristics, explore the internal mechanism of improved electromagnetic shielding properties of magnesium alloys, establish technology prototype of the control of electromagnetic shielding properties by means of second phase in magnesium alloys. The implementation of this project can provide scientific basis and theoretical basis for the development and application of high performance electromagnetic shielding magnesium alloys.

当今世界，电磁污染日益严重，开发高性能电磁屏蔽材料是实现电磁屏蔽的关键环节。镁合金是具有一系列优良性能，是一种极具潜力的电磁屏蔽材料，然而，迄今为止国内外对镁合金电磁屏蔽性能的基础研究工作非常有限，镁合金电磁屏蔽效能的主要影响因素和调控手段不甚清楚。本项目提出通过塑性变形和时效热处理的耦合作用，实现对镁合金析出相合理控制，并基于析出相特征与电磁屏蔽性能之间的内在关系，调控镁合金的电磁屏蔽效能。通过研究塑性变形过程中镁合金组织结构与织构特征及演变规律，研究时效热处理过程中镁合金第二相在特定晶面上的析出行为，分析第二相晶体结构微观特征与界面结构，研究镁合金电磁屏蔽性能与第二相特征之间的内在关系，分析镁合金电磁屏蔽性能提高的内在机制，建立利用第二相调控镁合金电磁屏蔽性能的技术原型。本项目实施可为高性能镁合金电磁屏蔽材料的发展和应用提供科学基础和理论依据。

随着社会经济快速发展，现代电磁污染日益严重，开发高性能电磁屏蔽材料是实现电磁屏蔽的关键环节。镁合金是具有一系列优良性能，是一种极具潜力的电磁屏蔽材料，然而，迄今为止国内外对镁合金电磁屏蔽性能的基础研究工作非常有限，镁合金电磁屏蔽效能的主要影响因素和调控手段不甚清楚。本项目提出了通过塑性变形和时效热处理的耦合作用，实现对镁合金析出相合理控制，并基于析出相特征与电磁屏蔽性能之间的内在关系，调控镁合金的电磁屏蔽效能。项目以Mg-Zn和Mg-Sn合金为主要对象，揭示了塑性变形作用条件下镁合金的组织、微结构与织构演变规律，弄清了时效热处理过程中第二相在特定晶面上的析出行为，查明了第二相特征参数与镁合金电磁屏蔽性能之间的内在联系，优化了塑性变形与热处理工艺参数，建立了高电磁屏蔽镁合金材料制备的特征参量耦合调控方法，获得了高性能电磁屏蔽镁合金材料制备技术原型，建立高性能电磁屏蔽镁合金成分设计准则，在此基础上发展了Mg-Sn-Zn-Ca-Ce高强高电磁屏蔽镁合金新材料。项目实施后，在国内外学术期刊上发表SCI收录论文22篇，其中高被引论文1篇；申请发明专利5项，授权3项；获得教育部自然科学二等奖1项（排名第1）、重庆市技术发明一等奖1项（排名第2）。