(1. 南京理工大學(xué)受控電弧智能增材技術(shù)工業(yè)和信息化部重點(diǎn)實(shí)驗(yàn)室，南京 210094；
2. 昆山華恒焊接股份有限公司，昆山 215300)
摘 要: 為了探索AZ91鎂合金在航空航天產(chǎn)品殼體和輕量化結(jié)構(gòu)件等領(lǐng)域的應(yīng)用，基于TIG增材制造工藝進(jìn)行了鎂合金增材試驗(yàn)，成功制備了一個單道多層薄壁樣件，并對其微觀組織和力學(xué)性能進(jìn)行了分析。結(jié)果表明：鎂合金增材樣件的底部、中部和頂部區(qū)域的顯微組織基本上都是等軸狀細(xì)晶組織，晶內(nèi)和晶界處有第二相β-Mg17Al12析出。樣件各區(qū)域的硬度值接近，硬度平均值為62 HV；相比于傳統(tǒng)壓鑄方法，增材樣件整體力學(xué)性能得到了提高，樣件中部區(qū)域的抗拉強(qiáng)度為276 MPa，提升了20%；斷后試樣的伸長率為13.1%，提升了87%。
關(guān)鍵字: AZ91鎂合金；電弧增材；微觀組織；力學(xué)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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