微振动是影响卫星等航天器中高分载荷测量精度的关键因素之一，利用材料本身具有的高阻尼特性设计减振器是实现振动快速衰减、抑制微振动干扰的一种重要技术途径，但其关键在于如何研制满足航天服役工况的微振动抑制敏感型高阻尼合金。本项目拟以具有高磁致伸缩特性的FeGa合金为研究对象，并基于正/负磁致伸缩复合相叠加增强材料阻尼性能的原理，设计和制备具有不同Al含量的Fe73Ga27-xAlx合金(x=0~10at.%)，系统研究Al及微量稀土元素(Ce、Tb、Dy等)添加对FeGa基合金力学和阻尼性能的影响，建立基于 “畴界面”为“阻尼源”调控阻尼性能的物理图像。项目研究预期可获得高性能FeGa基阻尼合金的设计原理和最优制备工艺，阐明相结构、畴结构、畴界面动性等协同提高微振动抑制阻尼本领的微观机理，为研发兼有高强韧、宽温域、微振动抑制敏感的FeGa基高阻尼合金及其他新型航天用高阻尼材料提供科学依据。

Micro-vibration is one of the key factors that affect the measurement accuracy of high precision instruments in spacecrafts such as satellites. It is an important way to achieve rapid attenuation for mechanical vibration and suppress micro-vibration interference based on the high damping characteristics of materials to design metal dampers. However, the key is how to develop such kinds of high-damping alloys that have micro-vibration sensitivity in space environment. . In this project, FeGa alloys with high magnetostrictive properties will be carefully studied in the aspects of damping property and mechanism. Based on the principle of positive/negative magnetostrictive multiphase enhancing material damping, Fe73Ga27-xAlx alloys with different Al content (x=0~10at.%) are designed and fabricated. The effects of Al and trace rare earth elements (Ce, Tb, Dy, etc.) on the mechanical and damping properties of FeGa-based alloys are systematically studied, and a physical image will be established based magnetic domain interface as damping source to control damping performance.. The project is expected to obtain design principle and optimum preparation route of high performance FeGa-based damping alloys, and clarify the mechanism of synergistic enhancement of micro-vibration suppression damping ability of by phase structure, domain structure and domain interface mobility, which helps to provide scientific basis on how to develop FeGa-based damping alloys as well as other new high-damping materials for aerospace with high-strength and ductility, wide temperature damping range and sensitive micro-vibration suppression as well.