Zhao Yaobang, Chen Bo, Li Wukai, Li Junchen, Shi Junmiao, Wang Baiming, Jin Feng
Shanghai Shenjian Precision Machinery Technology Co., Ltd., Shanghai 201600, China.
Key Laboratory of Pressure Systems and Safety, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China.
Materials (Basel). 2025 Apr 9;18(8):1713. doi: 10.3390/ma18081713.
Friction stir additive manufacturing (FSAM) technology is the ideal technique for aluminum alloy additive manufacturing from the perspective of defect control, microstructure regulation, and performance optimization. However, there is limited systematic fundamental research on the aluminum alloy FSAM. This study implemented a consumable-tool-based 5A06 FSAM process. By incorporating carbon nanotubes during the FSAM process, our research investigated its impact on grain refinement and the performance of the additive structure. The results show that the well-formed additive structure is composed of multiple layers of stirred metal. The microstructure of the additive structure of AA5A06 consists of refined recrystallized grains and deformed grains within each layer, while the interface between layers is composed of a finer-grain band, with an average grain size of 6 µm, whose tensile strength ranges from 225 MPa to 260 MPa, with an elongation of 26% to 32%. After the addition of carbon nanotubes, although the grain size was refined to 2 µm, there was no improvement in tensile strength, and the elongation was reduced. The tensile strength now ranges from 225 MPa to 270 MPa, with elongation between 12% and 16%.
搅拌摩擦增材制造（FSAM）技术从缺陷控制、微观结构调控和性能优化的角度来看，是铝合金增材制造的理想技术。然而，关于铝合金FSAM的系统基础研究有限。本研究实施了基于消耗性工具的5A06 FSAM工艺。通过在FSAM过程中加入碳纳米管，我们的研究调查了其对晶粒细化和增材结构性能的影响。结果表明，成型良好的增材结构由多层搅拌金属组成。AA5A06增材结构的微观结构由每层内的细化再结晶晶粒和变形晶粒组成，而层间界面由平均晶粒尺寸为6 µm的细晶带组成，其抗拉强度范围为225 MPa至260 MPa，伸长率为26%至32%。添加碳纳米管后，尽管晶粒尺寸细化至2 µm，但抗拉强度没有提高，伸长率降低。现在抗拉强度范围为225 MPa至270 MPa，伸长率在12%至16%之间。
