电弧增材4043铝合金显微组织及力学性能分析

Microstructure and Mechanical Properties of 4043 Aluminum Alloy Formed by Wire Arc Additive Manufacturing

采用熔化极氩弧为热源,ER4043焊丝为增材材料,电弧增材成型4043铝合金板材。利用扫描电子显微镜(SEM)和能谱仪(EDS)对其内部不同区域组织进行分析。使用电子万能试验机对其不同区域进行力学性能测试。结果表明:电弧增材成型4043铝合金板材内部组织为细小条状的Al-Si共晶呈一定方向性延伸分布于α固溶体内,且靠近增材成型顶部的Al-Si共晶分布相对于靠近成型基材的部位更加弥散;成型铝合金板材的力学性能呈现各向异性,平行于增材高度方向具有更好的力学性能,且靠近增材成型顶部的部位比靠近成型基材的部位具有更好的力学性能。

4043 aluminum alloy sheet was formed by wire arc additive manufacturing with argon arc as heat source and ER4043 welding wire as additive material. Scanning electron microscopy(SEM) and energy dispersive spectroscopy(EDS) were used to analyze the microstructure of different regions. The mechanical properties of different areas were tested by using electronic universal testing machine. The results show that the microstructure of 4043 aluminum alloy sheet formed by wire arc additive manufacturing is fine strip-shaped Al-Si eutectic, which extends and distributes in α solid solution in a certain direction, and the distribution of Al-Si eutectic near the top of additive manufacturing is more dispersed than that near the forming base material;the mechanical properties of the formed aluminum alloy sheet are anisotropic and the mechanical properties parallel to the additive height direction are better. The mechanical properties of the part near the top of the additive molding is better than that near the base material.