转速对厚板铝/镁异种材料搅拌摩擦焊摩擦产热及界面组织的影响

doi:10.11896/cldb.21090144

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Abstract The friction stir welding of 20 mm thick Al /Mg dissimilar materials was carried out by employing different rotational speeds. In this study, the influence of the rotation speed on the friction heat production, weld formation and interface structure of thick Al/Mg dissimilar materials by friction stir welding were examined using K-type thermocouple temperature measurement, scanning electron microscopy with an energy dispersive spectroscopy and electron probe micro analyzer. The results show that there is temperature gradient along the thickness direction of the workpiece, the temperature decreases gradually from upper to bottom. Furthermore, the temperature difference on the interfaces of the Al side is higher than that of Mg side at the same rotational speed. The peak temperature on the Al side is also higher than that on the Mg side for two symmetric points at the same thickness of weld. The weld formation gradually deteriorates with the increase of the speed. At 375 r/min, a band-shaped Al₃Mg₂ layer with a thickness of 12 μm and a thickness of 74 μm Mg+Al₁₂Mg₁₇ eutectic layer were found on the top of the Mg side interface. The thickness of IMCs and eutectic layer in the middle part is smaller than that in the upper part, while no eutectic layer is found in the bottom part. As the rotational speed increased, the thickness of the Al₃Mg₂ layer and the eutectic layer increased significantly.The joint fracture occurred between the Al₃Mg₂ layer and the Al alloy strip at the Mg side interface.

Key words： Al/Mg dissimilar material friction stir welding thick plate frictional heat production interface microstructure

Published: 25 April 2023 Online: 2023-04-24

CLC number:

TG4

Fund:National Natural Science Foundation of China (51874179).

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	Articles by authors
	NIE Hao
	XU Yang
	KE Liming
	XING Li

Cite this article:

NIE Hao,XU Yang,KE Liming, et al. Effect of Rotational Speed on Frictional Heat Production and Interface Structure of Thick Plate Al/Mg Dissimilar Materials by Friction Stir Welding[J]. Materials Reports, 2023, 37(8): 21090144-6.

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http://www.mater-rep.com/EN/10.11896/cldb.21090144 OR http://www.mater-rep.com/EN/Y2023/V37/I8/21090144

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