Here, we compare the porosity, microstructure and mechanical property of 4047 Al–Si alloys prepared by wire-arc additive manufacturing (WAAM) and conventional casting. X-ray microscopy reveals that WAAM causes a higher volume fraction of gas pores in comparison with conventional casting. Effective refinements of α-Al dendrites, eutectic Si particles and Fe-rich intermetallic compounds are achieved by WAAM, resulting from its rapid solidification process. Both ultimate tensile strength (UTS, up to 205.6 MPa) and yield stress (YS, up to 98.0 MPa) are improved by WAAM at the expense of elongation after fracture. The mechanical property anisotropy between scanning direction and build direction is minimal for alloys via WAAM. Additional microstructure refinement and strength enhancement are enabled by increasing the travel speed of welding torch from 300 to 420 mm/min.

在这里，我们比较了通过线弧增材制造 (WAAM) 和常规铸造制备的 4047 Al-Si 合金的孔隙率、微观结构和机械性能。X 射线显微镜显示，与传统铸造相比，WAAM 会导致更高的气孔体积分数。由于其快速凝固过程，WAAM 实现了 α-Al 枝晶、共晶硅颗粒和富铁金属间化合物的有效细化。WAAM 提高了极限抗拉强度（UTS，高达 205.6 MPa）和屈服应力（YS，高达 98.0 MPa），但牺牲了断裂后的伸长率。对于通过 WAAM 的合金，扫描方向和构建方向之间的机械性能各向异性最小。