Huang Yang, Li Weiwei, Wu Mingdong, Xiao Daihong, Huang Lanping, Liu Wensheng
National Key Laboratory of Science and Technology on High-Strength Structural Materials, Central South University, Changsha 410083, China.
Materials (Basel). 2023 Sep 20;16(18):6308. doi: 10.3390/ma16186308.
The Al-Mg-Li alloy is ideal for ultra-lightweight aircraft components, and its further performance improvement is of great interest in the aerospace industry. In this study, the effects of various beryllium (Be) additions (Be-free, 0.1, 0.25, 0.50 wt.%) on the microstructure, mechanical, and corrosion performance of the Al-Mg-Li alloys were systematically investigated. The optimal tensile property was obtained in the alloy which added 0.1 wt.% Be with an ultimate tensile strength (UTS), yield strength (YS), and elongation (El) of 530 MPa, 370 MPa, and 9.2%, respectively. Trace Be addition promotes the grain refinement of the as-cast alloy ingot and contributes positive effects to the recrystallization, bringing improvement of the tensile property. Meanwhile, the best anti-corrosion behavior is also presented at 0.1 wt.% Be is added, due to its potential to reduce the width of precipitates free zone (PFZ). As the Be content increases to an excessive level, the comprehensive performance decreases. Therefore, it is strongly recommended that adding trace Be elements into Al-Mg-Li alloys has a positive effect on the comprehensive service performance.
铝镁锂合金是超轻型飞机部件的理想材料，其性能的进一步提升在航空航天工业中备受关注。在本研究中，系统地研究了添加不同含量铍（Be）（无铍、0.1%、0.25%、0.50%质量分数）对铝镁锂合金微观结构、力学性能和耐腐蚀性能的影响。添加0.1%质量分数Be的合金获得了最佳拉伸性能，其极限抗拉强度（UTS）、屈服强度（YS）和伸长率（El）分别为530 MPa、370 MPa和9.2%。微量Be的添加促进了铸态合金锭的晶粒细化，并对再结晶产生积极影响，从而提高了拉伸性能。同时，添加0.1%质量分数Be时也表现出最佳的耐腐蚀性能，这是因为它有减小无析出带（PFZ）宽度的潜力。当Be含量增加到过量时，综合性能下降。因此，强烈建议在铝镁锂合金中添加微量Be元素对综合使用性能有积极影响。
