刘浩,温泉,任寿伟,等.搅拌摩擦增材修复2A14铝合金孔型缺陷组织与性能研究[J].精密成形工程,2025,17(5):77-85.
LIU Hao,WEN Quan,REN Shouwei,et al.Microstructure and Properties of Repaired Pore Defects in 2A14 Aluminum Alloy by Friction Stir Additive[J].Journal of Netshape Forming Engineering,2025,17(5):77-85. |
| 搅拌摩擦增材修复2A14铝合金孔型缺陷组织与性能研究 |
| Microstructure and Properties of Repaired Pore Defects in 2A14 Aluminum Alloy by Friction Stir Additive |
| 投稿时间：2024-07-14 |
| DOI：10.3969/j.issn.1674-6457.2025.05.009 |
| 中文关键词: 静轴肩搅拌摩擦焊 增材修复 2A14 Al2Cu沉淀相 力学性能 |
| 英文关键词: stationary shoulder friction stir welding additive repair 2A14 Al2Cu precipitation phase mechanical properties |
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| 中文摘要: |
| 目的 研究静轴肩搅拌摩擦增材技术(SSFSW)对2A14铝合金构件孔型缺陷增材修复后修复区微观组织和力学性能的影响。方法 采用SSFSW工艺方法对9.5 mm厚的2A14铝合金圆孔台阶面进行增材修复，通过光学显微镜、电子扫描显微镜、显微维氏硬度计及拉伸试验机等测试手段，对修复后接头的各项性能变化进行研究分析。结果 修复接头的增材区与基体区表面基本不存在因搅拌头下压而导致的材料减薄现象，且增材区与基体界面能够实现较好的冶金结合。扫描电镜的观察结果显示，增材区内部材料流动性好且组织结构致密，组织晶粒度得到明显细化，增材修复区内的Al2Cu沉淀相发生动态再结晶，呈颗粒状弥散分布在α-Al基体中。增材区平均显微硬度为115HV，较基体区的135HV降低了约14.8%。修复后构件的平均拉伸力达到52 042 N。相对于基体区，增材区断口宏观形貌更加平整，微观韧窝形态明显变小、深度变浅且分布致密，总体表现出韧性断裂特征。结论 SSFSAM技术可实现9.5 mm厚2A14铝合金圆孔形台阶缺陷的修复，但力学性能略微降低。 |
| 英文摘要: |
| The work aims to study the microstructure and mechanical properties of the repaired area in 2A14 aluminum alloy components after additive repair of component hole defects by SSFSAM technology. The SSFSW process was used to perform additive repair on the step surface of a 9.5 mm thick 2A14 aluminum alloy circular hole. By testing methods such as optical microscope, electron scanning microscope, micro Vickers hardness tester, and tensile testing machine, the various property changes of the repaired joint were studied and analyzed. There was basically no material thinning phenomenon caused by the downward pressure of the tool on the surface of the additive area and substrate area of the repaired joint. The interface between the additive area and the substrate could achieve good metallurgical bonding. According to the results of scanning electron microscopy, the internal material of the additive area had good fluidity and density, and the grain structure was refined. The Al2Cu precipitate phase in the additive repair area underwent dynamic recrystallization and was dispersed in granular form in the α-Al substrate. The average microhardness of the additive area was 115HV, which was about 14.8% lower than the 135HV of the substrate area. The average tensile force of the repaired component reached 52 042 N. The macroscopic morphology of the fracture surface in the additive area was flat, and the morphology of the ductile dimples was significantly smaller, shallower, and denser compared to the substrate, exhibiting ductile fracture characteristics. SSFSAM technology can repair the step defect of 9.5 mm thick 2A14 aluminum alloy circular hole, but slightly reduce the mechanical properties. |
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