Study on the Microstructure and Properties of Al-Zn-Mg-Cu Alloy Produced by Wire-arc Additive Manufacturing
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.
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