Effect of cooling condition on microstructure and properties of friction stir welded joints of 5E83 aluminum alloy

doi:10.13251/j.issn.0254-6051.2022.01.022

Abstract

Abstract: Effect of water-cooling and air-cooling condition on microstructure and properties of the friction stir welded (FSW) joints of 5E83 aluminum alloy at rotation speed of 400, 800, 1200 r/min was investigated by means of optical microscope, scanning electron microscope (SEM), electron backscattered diffraction (EBSD), microhardness test and tensile test. The results show that compared with air-cooling condition, the flash of friction stir welded joints under water-cooling condition and the onion ring formation area reduce, while the hardness of the weld nugget area is significantly improved. When the rotation speed is 800 r/min compared with air-cooling, the tensile strength of the joint under water-cooling is improved, the joint efficiency is increased by 11%, the hardness is increased by 11%, and the average grain size of the weld nugget area is reduced by 43%. However, the fracture dimples of the joint under the air cooling condition are large and deep, and the plasticity is better, while the fracture dimples under the water-cooling condition are small and shallow, and the plasticity decreases.

Key words: friction stir welding, 5E83 aluminum alloy, cooling condition, tensile strength, average grain size

CLC Number:

TG456.9

Li Ang, Gao Kunyuan, Wen Shengping, Huang Hui, Nie Zuoren. Effect of cooling condition on microstructure and properties of friction stir welded joints of 5E83 aluminum alloy[J]. Heat Treatment of Metals, 2022, 47(1): 130-134.

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