铝合金连续进给搅拌摩擦增材制造技术  

Aluminum alloy friction stir additive manufacturing technique with continuous feedstocks

作　　者：陈会子 孟祥晨[1] 陈佳霖 谢聿铭 赵耀邦[2] 黄永宪[1] CHEN Huizi;MENG Xiangchen;CHEN Jialin;XIE Yuming;ZHAO Yaobang;HUANG Yongxian(Harbin Institute of Technology State Key Laboratory of Advanced Welding and Joining,Harbin,150001;Shanghai Spaceflight Precision Machinery Institute,Shanghai,201600)

机构地区：[1]哈尔滨工业大学,先进焊接与连接国家重点实验室,哈尔滨150001 [2]上海航天精密机械研究所,上海201600

出　　处：《焊接学报》2022年第11期63-67,I0006,共6页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(52175301);中国航天科技集团公司第八研究院产学研合作基金资助项目(SAST2020-108)。

摘　　要：为解决固相增材制造过程送料不连续及层间界面弱连接的难题,提出了连续进给搅拌摩擦增材制造的方法,设计了一个带孔的储料腔和一个可对丝材进行热塑化并连续挤压的螺杆拓扑结构搅拌头.结果表明,Al-Si合金丝材经由送丝孔进入储料腔,搅拌头连续热塑化并向下挤压材料,搅拌针在堆积层间的搅拌作用有效地提高了堆积层间的界面结合能力,成功实现了铝合金连续进给搅拌摩擦增材制造成形并解决了层间界面弱连接的难题.单层增材制造堆积层厚度平均为1.2 mm,Al-Si合金增材制造成形件沿堆积方向的抗拉强度和断后伸长率分别为207.1 MPa±3.2 MPa和19.6%±5.3%,该技术为实现大型铝合金构件全固相增材制造提供了一种可行性方案.In order to solve the inherent issues of discontinuous feedstocks and kiss bonding in the solid-state additive manufacturing process, a novel friction stir additive manufacturing with continuous feedstocks was proposed. The applied tools including a storage cavity with a feeding hole and a screw topology which can thermo-plasticize and continuously extrude the Al-Si alloy wire were designed. The results showed that the Al-Si alloy wire was conveyed to the feeding hole into the storage cavity, and the pin continuously thermo-plasticized and extruded downward Al-Si alloy materials. The probes at the bottom of the pin were used to stir and process the thermo-plasticized materials, which can extremely improve the bonding efficiency of the interfaces. The friction stir additive manufacturing with continuous feeding aluminum alloy wires was successfully realized, and the inherent issue of kiss bonding of interfaces between layers was solved. The thickness of the individual layer was about 1.2 mm. The tensile strength and elongation of the Al-Si alloy formed part along the stacking direction have little differences, which were 207.1 ± 3.2 MPa and 19.6 ± 5.3%, respectively. Friction stir additive manufacturing with continuous feedstocks can provide a feasible process method towards full solid-state additive manufacturing of large aluminum alloy parts.

关 键 词：搅拌摩擦增材制造 固相增材制造 铝合金 工艺特性 力学性能 

分 类 号：TG453.9[金属学及工艺—焊接]