期刊
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
卷 27, 期 8, 页码 621-628出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/13621718.2022.2096346
关键词
Frictions stir welding; ultrasonic vibration; intermetallic compounds; dissimilar Al; Mg alloys
资金
- National Natural Science Foundation of China [52035005]
Frictions stir welding and ultrasonic vibration enhanced FSW of dissimilar Al/Mg alloys were studied. It was found that the growth of IMC layer was suppressed in UVeFSW due to the improvement of grain recrystallization and the promotion of dislocation consumption, leading to a reduced diffusion rate of atoms.
Frictions stir welding (FSW) and ultrasonic vibration enhanced FSW (UVeFSW) of dissimilar Al/Mg alloys were conducted, and the intermetallic compounds (IMCs) layers formed at Al/Mg interface in welds were characterised by TEM. It was found that the IMCs thickness was significantly reduced in UVeFSW, and the IMCs were generated by solid-state atomic diffusion in butt joints under the used welding conditions since the measured temperature at the tool/workpiece interface was far below the eutectic points. The EBSD characterisation showed that ultrasonic vibration improved the degree of grain recrystallization on both sides of the IMCs layers and promoted the consumption of dislocations, which resulted in a reduced diffusion rate of atoms. Therefore, the growth of IMC layer was suppressed in UVeFSW.
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