【摘要】 为研究不同沉积路径对铝基FGMs试样微观组织与力学性能的影响规律，采用旁轴填丝辅助熔化极气体保护电弧增材制造（GMA-AM）工艺，通过Z字形与螺旋形摆动路径分别制备了6种梯度组分（100%ER2319、 90%ER2319+10%ER5356、 80%ER2319+20%ER5356、 70%ER2319+30%ER5356、60%ER2319+40%ER5356、50%ER2319+50%ER5356）的ER2319/ER5356铝基功能梯度材料（FGMs）试样，并对两种沉积路径的试样宏观形貌、微观组织、物相组成、硬度分布及拉伸性能进行分析。结果表明，在同一梯度组分下，螺旋形摆动FGMs试样的晶粒尺寸相对较小，沉积层平均显微硬度高于Z字形摆动试样；随着ER5356含量提高，两种路径沉积试样的抗拉强度均呈现逐渐上升的趋势，断后伸长率则逐渐下降，主要是由于Cu的析出强化向Mg的固溶强化转变所致。研究可为增材制造成形质量和综合力学性能的提高提供借鉴。更多还原

【Abstract】 To study the influnce of different depositing trajectory on the microstructure and mechanical properties of aluminumbased FGMs samples, gas metal arc additive manufacturing(GMA-AM) process was adoped, ER2319/ER5356 aluminum-based FGMs samples with 6 gradient compositions(100%ER2319, 90%ER2319+10%ER5356, 80%ER2319+20%ER5356, 70%ER2319+30%ER5356, 60%ER2319+40%ER5356, 50%ER2319+50%ER5356) were prepared using zigzag and spiral swing paths, respectively. The macroscopic morphology, microstructure, phase composition,hardness distribution and tensile properties of samples are analyzed from two different depositing trajectory. Results indicate that, under identical gradient composition, FGMs specimens fabricated by the spiral oscillation exhibit relatively finer grain sizes and higher average microhardness compared to those produced via the zigzag oscillation specimens. As ER5356 increases, the tensile strength of specimens deposited using both paths shows a gradual upward trend, while elongation decreases. This is attributed to a transition of the strengthening mechanism from precipitation strengthening of Cu to solid solution strengthening of Mg. The findings provide a reference for improving the forming quality and enhancing the overall mechanical properties of AM components.更多还原