Effects of ultrasonic on friction stir Al–Ti welds: a comparative study
Effects of ultrasonic on friction stir Al–Ti welds: a comparative study
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超声波对搅拌摩擦铝钛焊缝影响的对比研究
DOI：
10.1080/13621718.2021.1968233
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发表时间：
2021-08
影响因子：
3.3
通讯作者：
Mingrun Yu;Hongyun Zhao;Fei Xu;Tiejue Chen;Li Zhou;Xiaoguo Song;N. Ma
中科院分区：
文献类型：
--
作者：
Mingrun Yu;Hongyun Zhao;Fei Xu;Tiejue Chen;Li Zhou;Xiaoguo Song;N. Ma
对AA 6061和Ti6 Al 4V合金进行了超声搅拌摩擦焊（UaFSW）和常规搅拌摩擦焊（FSW）试验。频率为20 kHZ、振幅为10 μm的超声波作用下，超声搅拌摩擦焊产生了较小的波动和较大的闪光，搅拌区较搅拌摩擦焊扩大。超声辅助消除了Al/Ti界面处的微裂纹，同时在Al/Ti界面附近形成了一个含有Ti碎片和金属间化合物的混合区。作为与超声形成的混合区，UaFSW焊缝在搭接剪切试验中显示出两倍的强度，与FSW焊缝相比。UaFSW焊缝的裂纹在混合区中扩展，而FSW焊缝的裂纹沿着Al/Ti界面扩展。
Ultrasonic assisted friction stir welding (UaFSW) and conventional friction stir welding (FSW) were conducted on AA6061 and Ti6Al4V alloys. Smaller waves and larger flashes were obtained by UaFSW with 20 kHZ frequency and 10 μm amplitude ultrasonics, and the stir zone was expanded as compared to the FSW one. Interfacial micro-cracks were eliminated with the ultrasonic assistance while a mixed zone was formed beside the Al/Ti interface, containing Ti fragment and intermetallic precipitates. As a mixed zone formed with ultrasonics, the UaFSW weld showed doubled strength in the lap shear tests, as compared to the FSW weld. Cracks propagated in the mixed zone weld of the UaFSW weld, whereas propagated along the Al/Ti interface for the FSW weld.