摘要: |
使用CMT-PADV、CMT-ADV和CMT-P三种电弧模式电弧增材制造(WAAM)了Al-Zn-Mg-Cu合金直壁墙,探究了不同电弧模式对直壁墙显微组织和力学性能的影响。结果表明,三种电弧模式下的WAAM直壁墙均由粗大柱状晶构成,晶界上分布着连续的Mg(Al,Zn,Cu)2共晶相,并且气孔率较高。粗大的柱状晶和晶界上连续的共晶相使直壁墙水平方向的拉伸性能,尤其是延伸率较差,并且其拉伸试样的断裂行为以沿晶断裂为主。CMT-PADV模式下直壁墙水平方向的拉伸性能最好,主要原因是该模式下直壁墙的气孔率最低,且柱状晶生长方向与拉应力方向的夹角最小。 |
关键词: 电弧增材制造;Al-Zn-Mg-Cu合金;电弧模式;微观组织;力学性能 |
基金项目: |
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Study on the Microstructure and Properties of Al-Zn-Mg-Cu Alloy Produced by Wire-arc Additive Manufacturing |
Qie Mofan1, He Changshu2, Li Songbin1, Yin Yuhuan1, Feng Xiaosong1
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1. Shanghai Aerospace Equipments Manufacturer Co., Ltd., Shanghai 201100;2. School of Materials Science and Engineering, Northeastern University, Shenyang 110819
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Abstract: |
Three arc modes, CMT-PADV, CMT-ADV and CMT-P were employed to fabricate WAAM Al-Zn-Mg-Cu alloy straight walls, investigating the influence of different arc modes on the microstructure and mechanical properties of the straight walls. In all three arc modes, the WAAM straight walls were composed of columnar grains, with a continuous Mg(Al,Zn,Cu)2 eutectic phase distributed along the grain boundaries, and high porosity. The columnar grains and eutectic phases result in lower horizontal tensile properties, especially elongation, and the fracture behavior of the tensile samples is mainly intergranular fracture. Among them, the straight walls fabricated by the CMT-PADV mode showed the best tensile properties in the horizontal direction, primarily because of the lowest porosity in this mode and the smallest angle between the growth direction of the columnar grains and the direction of the tensile stress. |
Key words: wire arc additive manufacturing;Al-Zn-Mg-Cu alloy;arc mode;microstructure;tensile properties |