含Cu镁锂合金组织与性能调控研究进展

镁锂合金具有超低密度、极高的比强度与比刚度、优异的电磁屏蔽性能及阻尼性能，目前广泛应用于追求轻量化的航空航天、新能源汽车、电子产品、生物医疗等领域。由于合金元素镁和锂均为活泼金属，在服役过程中镁锂合金会存在多种形式的腐蚀过程，同时二元镁锂合金强度较低，以上两点严重制约了其广泛应用。耐蚀涂层可以有效提高镁锂合金的腐蚀抗力，含铜镀层被证实能够提升镁锂合金耐蚀性。改善镁锂合金强度的工艺主要有合金化、热处理、加工变形等，其中合金化是最基本的强化手段。Cu合金化可以对镁锂合金中的组织与性能进行调控，改善镁锂合金的强度。本文对含Cu镁锂合金的研究进展及其应用情况进行综述，总结了目前含Cu镁锂合金耐蚀与力学性能的相关研究成果，重点梳理了铜元素在镁锂合金中的作用，为含Cu镁锂合金的实际应用提供一定的理论指导。

Research Progress in Microstructure and Mechanical Properties of Cu-Containing Magnesium-Lithium Alloys

Magnesium-lithium alloys possess low density, extremely high specific strength and stiffness, excellent electromagnetic shielding behavior and damping behavior, which are currently widely used aerospace, new energy automotive industry, electronic products, biomedical and other fields. As both elemental Mg and Li are chemically active, magnesium-lithium alloys have poor corrosion resistance due to various types of corrosions during service. At the same time, binary magnesium-lithium alloys have low strength, the above two factors seriously restrict their wide applications. The corrosion resistance of magnesium-lithium alloys can be improved by proper coating and Cu-containing coatings are already proved to improve the corrosion resistance of magnesium-lithium alloys. The approaches for improving the strength of magnesium-lithium alloys include alloying, heat treatment, plastic deformation etc., and alloying is the most basic strengthening method. By adding Cu to tune the structure and properties, the strength of magnesium-lithium alloys can be improved. This paper reviewed the research progress and application of Cu-containing magnesium-lithium alloys and focuses on the current results related to corrosion resistance and mechanical properties, providing a theoretical basis for the practical application of Cu-containing magnesium-lithium alloys.