随散热器轻量化需求增加，轻质高强镁合金在电子产品散热器上具有广泛的应用前景。此外，轻质高导热镁合金在空间低温构件上的应用近来也受到关注。因此，镁合金的低温（2K-300K）和中温（300K-600K）范围导热机理研究及高导热镁合金研发逐渐引起了研究者关注。本项目将首先以商业纯镁为主，通过改变纯镁的显微组织，研究晶粒度、织构、位错和挛晶等对纯镁低温和中温热导率和电导率的影响规律；然后通过添加不同的合金元素，研究固溶合金元素和第二相对镁合金低温和中温热导率和电导率的影响规律。根据不同温度区间，纯镁和镁合金的热导率和电导率随各影响因素(晶粒度、孪晶、织构、合金元素)的变化规律，通过计算、分析，分离出各种散射机制对热导率的贡献，揭示合金元素和显微组织在不同温度区间对镁合金热导率的影响机制，揭示纯镁和镁合金的导热机理。研究成果将丰富和发展纯镁和镁合金的导热理论，为新型高导热镁合金的开发提供理论指导。

With the increasing requirement of heat sinks with light weight, Mg alloys with light weight and high strength have great potential applications in heat-sinks of electronic components. In addition, magnesium alloys with low density and high thermal conductivity are regarded as potential candidate for low temperature aerospace components. In recent years, the development of Mg alloys with high thermal conductivity and their heat conduction mechanism at low temperatures (2K-300K) and medium temperatures (300K-600K) have drawn great attention of researchers. The first step of the project is to investigate the effect of grain size, dislocation, twinning and texture on the thermal conductivity and electric conductivity of pure Mg at low temperatures (2K-300K) and medium temperatures (300K-600K) by modify the microstructure of the pure Mg. Then the effect of alloying solute atoms and second phases on the thermal conductivity and electric conductivity of Mg alloys at low temperatures and medium temperatures is studied. On the basis of the understanding of the variation of thermal conductivity at different temperature range with alloying elements and microstructure, the thermal conductivity will be revealed by calculation and analysis, so that the different scattering mechanisms contributing the thermal conductivity will be separated. As a result, the effect of alloying elements and microstructure on heat conductivity of Mg and Mg alloys at different temperature ranges will be revealed. The project will further enrich and develop of the heat conduction theory of pure magnesium and magnesium alloys, and have great signifcance for the development of new high performance magnesium alloys with high thermal conductivity.