(1. 南京理工大学受控电弧智能增材技术工业和信息化部重点实验室，南京 210094；
2. 昆山华恒焊接股份有限公司，昆山 215300)
摘 要: 为了探索AZ91镁合金在航空航天产品壳体和轻量化结构件等领域的应用，基于TIG增材制造工艺进行了镁合金增材试验，成功制备了一个单道多层薄壁样件，并对其微观组织和力学性能进行了分析。结果表明：镁合金增材样件的底部、中部和顶部区域的显微组织基本上都是等轴状细晶组织，晶内和晶界处有第二相β-Mg17Al12析出。样件各区域的硬度值接近，硬度平均值为62 HV；相比于传统压铸方法，增材样件整体力学性能得到了提高，样件中部区域的抗拉强度为276 MPa，提升了20%；断后试样的伸长率为13.1%，提升了87%。
关键字: AZ91镁合金；电弧增材；微观组织；力学性能
（1. Key Laboratory of Controlled Arc Intelligent Additive
Technology, Ministry of Industry and Information Technology, Nanjing University
of Technology, Nanjing 210094, China;
2. Kunshan Huaheng Welding Co., Ltd., Kunshan
215300, China）
Abstract:In order to explore the application of AZ91 magnesium alloy arc additive in aerospace shell products and structural lightweighting, a single-channel multilayer thin-walled sample was successfully manufactured based on the TIG arc additive manufacturing process, and its microstructure and mechanical properties were analyzed. The results show that the microstructure at the bottom, middle and top of the additive manufactured magnesium alloy is basically equiaxed fine grain structure, and the second phase β-Mg17Al12 is precipitated both in the grains and at the grain boundaries. The hardness value of each area of the sample is close, and the average hardness value is 62 HV. Compared with the traditional die-casting method, the overall mechanical properties of the additive manufactured sample are improved. The tensile strength in the middle area of the sample is 276 MPa, which is increased by 20%, and the elongation after fracture is 13.1%, which is increased by 87%.
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