激光3D打印AlSi10Mg铝合金点阵结构材料的组织和力学性能

Microstructure and mechanical properties of laser 3D printed AlSi10Mg aluminum alloy lattice materials

以不同激光3D打印参数制备了Al Si10Mg铝合金点阵结构材料,探索其最优化打印参数,研究了铝合金点阵结构材料的组织和性能,以及后续热处理对其组织性能的影响。结果表明,最优化打印参数为:环境温度80℃,粉层厚度30μm,激光束直径80μm,激光能量370 W,激光扫描速度1300 mm/s。制备的铝合金点阵结构材料空洞缺陷少,致密性高,显微组织呈一层层交错堆垛的激光熔池,为细小的α-Al等轴胞状晶和球状Si颗粒相组成,性能良好。经热处理后,原激光熔池缺陷、等轴胞状晶特征消失,Si颗粒相不断析出并长大,硬度和静态压缩试验下的平台应力降低,压缩性能下降。

Al Si10 Mg aluminum alloy lattice materials were prepared by selecting different laser 3 D printing parameters,and the optimized printing parameters were explored.The microstructure and properties of aluminum alloy lattice materials and the influence of subsequent heat treatment on it were studied.The results show that the optimal printing parameters include printing temperature(80℃),microns powder layer thickness(30μm),lasing beam diameter(80μm),laser energy(370 W),and laser scanning speed(1300 mm/s).The prepared aluminum alloy lattice material has few cavity defects,high compactness,and the microstructure is a layer upon layer crisscrossing laser molten pool,which is composed of small α-Al equiaxial cellular crystal and spherical Si particle phase,and has good performance.After heat treatment,the features of the original laser molten pool defects and equiaxial cellular crystals disappear,the Si particle phase continuously precipitates and grows up,meantime,the hardness and platform stress decrease under the compression performance,so does the static compression properties.