(1. 上海交通大學(xué) 輕合金精密成型國家工程研究中心，上海 200240；
2. 上海交通大學(xué) 金屬基復(fù)合材料國家重點實驗室，上海 200240)
摘 要: 鎂合金作為最為輕質(zhì)的金屬結(jié)構(gòu)材料，是實現(xiàn)航空航天、交通運輸以及電子通訊等輕量化的重要材料。然而，鎂合金在應(yīng)用過程中仍面臨一系列瓶頸問題。研究結(jié)果表明，稀土元素對于改善鎂合金的性能具有至關(guān)重要的作用。本文聚焦稀土元素對鎂合金組織的作用機制，討論了稀土元素對鎂合金塑性變形能力、導(dǎo)熱性能及耐腐蝕性能的影響規(guī)律。總結(jié)發(fā)現(xiàn)稀土元素能夠通過調(diào)控織構(gòu)和變形過程中的滑移機制提高塑性，影響第二相的析出行為，改善導(dǎo)熱性能；改變析出相的化學(xué)性質(zhì)、形貌與分布等提高耐腐蝕性能。展望通過調(diào)控稀土元素設(shè)計新型高性能結(jié)構(gòu)功能一體化稀土鎂合金的發(fā)展方向。
關(guān)鍵字: 稀土鎂合金；塑性；熱導(dǎo)；耐腐蝕
（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
