(1. 上海交通大学 轻合金精密成型国家工程研究中心，上海 200240；
2. 上海交通大学 金属基复合材料国家重点实验室，上海 200240)
摘 要: 镁合金作为最为轻质的金属结构材料，是实现航空航天、交通运输以及电子通讯等轻量化的重要材料。然而，镁合金在应用过程中仍面临一系列瓶颈问题。研究结果表明，稀土元素对于改善镁合金的性能具有至关重要的作用。本文聚焦稀土元素对镁合金组织的作用机制，讨论了稀土元素对镁合金塑性变形能力、导热性能及耐腐蚀性能的影响规律。总结发现稀土元素能够通过调控织构和变形过程中的滑移机制提高塑性，影响第二相的析出行为，改善导热性能；改变析出相的化学性质、形貌与分布等提高耐腐蚀性能。展望通过调控稀土元素设计新型高性能结构功能一体化稀土镁合金的发展方向。
关键字: 稀土镁合金；塑性；热导；耐腐蚀
（1. National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, Shanghai 200240, China;
2. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China）
Abstract:Magnesium alloys, as the lightest structural metals, are considered to be the promising materials to achieve the lightweight of aerospace, transportation and digital electronic communication. However, magnesium alloys still exhibit several limitations in the application. It has been reported that rare earth (RE) elements generally play a critical role in the improvement of the performance for Mg alloys. This work focuses on the effect of RE elements on the microstructure and the performance of Mg alloys, including the plastic deformation behavior, thermal conductivity and corrosion resistance. It has been found that the addition of RE elements can improve the ductility through weakening the texture and controlling the deformation mechanisms. Furthermore, the thermal conductivity of Mg alloys can be enhanced through altering the precipitation behavior. The corrosion resistance is significantly promoted by influencing the chemical properties, morphology and distribution of precipitates. This work looks forward to the development of high-performance structure-function integration Mg-RE alloys.
Key words: rare earth-magnesium alloys; ductility; thermal conductivity; corrosion resistance
