Microstructural characterization and mechanical properties of aluminum 6061-T6 plates welded with copper insert plate (Al/Cu/Al) using friction stir welding
Microstructural characterization and mechanical properties of aluminum 6061-T6 plates welded with copper insert plate (Al/Cu/Al) using friction stir welding
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DOI：
10.1016/s1003-6326(18)64675-8
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发表时间：
2018-03-01
影响因子：
4.5
通讯作者：
Pourasl, Hamed H.
中科院分区：
文献类型：
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作者：
Khojastehnezhad, Vahid M.;Pourasl, Hamed H.
采用搅拌摩擦焊技术，以纯铜（Al/Cu/Al）为镶嵌物，对两块6061-T6铝合金板进行了连接，研究了铜镶嵌物对连接性能的影响。异种焊接的结果进行了比较，AA 6061摩擦搅拌焊缝无铜插入（铝/铝）。采用光学显微镜和扫描电子显微镜对焊接试样进行了显微组织观察。利用X射线衍射分析了Al/Cu/Al试样的相组成。在转速为950 r/min，焊接速度为50 mm/min的条件下，Al/Cu/Al焊接接头无缺陷。焊接熔核区（WNZ）的显微组织观察表明，Al/Cu/Al接头形成了类复合组织，促进了Al和Cu的冶金结合。XRD结果表明，形成了金属间化合物（IMC），如Al 4Cu 9和Al 2Cu。此外，据观察，与铜插入板的焊缝的硬度是高于其他样品，由于更多的位错密度和硬度值的明显上升，观察到由于IMC的存在。由于铝与铜之间存在较强的冶金结合，采用铜插板的接头的抗拉强度高于其它试样。
Friction stir welding was used to join two aluminum 6061-T6 plates with an insert of a pure copper plate (Al/Cu/Al), and then the influence of the copper insert on the joint performance was studied. The dissimilar welding results were also compared with AA 6061 friction stir welds produced without copper insert (Al/Al). Optical and scanning electron microscopes were used for the microstructural observations of the welded samples. X-ray diffraction analysis was used to analyze phase component of the Al/Cu/Al specimen. A defect-free joint was observed for the Al/Cu/Al joint at a rotational speed of 950 r/min and a welding speed of 50 mm/min. Microstructural observation of the weld nugget zone (WNZ) demonstrates the formation of composite-like structure which promotes metallurgical bonding of aluminum and copper. XRD results show the formation of intermetallic compounds (IMCs), such as Al4Cu9 and Al2Cu. Furthermore, it was observed that the hardness of the weld with the Cu insert plate is higher than that of other samples due to more dislocation density and a distinct rise in hardness values was observed due to the presence of IMCs. The ultimate tensile strength of the joint with copper insert plate is higher than that of the other sample due to the strong metallurgical bonding between Al and Cu.