6005A-T5铝合金搅拌摩擦焊接头组织与疲劳性能

doi:10.11896/cldb.20030110

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Abstract The effects of different welding parameters on microstructure and fatigue properties of 6005A-T5 aluminum alloy friction stir welding (FSW) joints were studied by optical microscopy (OM), electron backscattered diffraction (EBSD), transmission electron microscope (TEM), Vickers hardness, and high cycle fatigue tests. The results showed that dynamic recrystallization occurred in the nugget zone (NZ) during the welding process, resulting in the formation of fine equiaxed grains, and the precipitation phases dissolve back into the Al-matrix. The grain morphology and size in the heat affected zone (HAZ) are similar to that of the base material, and there are two kinds of precipitation phases (β′ phase and Q′ phase). The higher the rotating speed or the lower the welding speed of the tool means the higher welding heat input, which will reduce the fatigue strength of FSW joint under 10⁷ cycles. All the fatigue cracks were initiated on the surface of the samples. At the initial stage of fatigue crack propagation, the crack propagates along the grain boundary. As the crack continued to expand, it gradually turned into transgranular expansion, and the fracture morphology showed cleavage fracture, and finally the instability fracture turned into ductile fracture.

Key words： 6005A-T5 aluminum alloy friction stir welding microstructure microhardness fatigue

Published: 28 January 2021

CLC number:

TG457.1

Fund:The National Key R & D Program of China (2016YFB0300902, 2016YFB0300905)

About author:: Jingxuan Liureceived his M.S. degree in June 2019 from Jiangxi University of Science and Technology. At present, he learned in General Research Institute for Nonferrous Metals, focusing on welding technology of aluminum alloy.
Jian Shen, Ph. D., professor, doctoral tutor. Mainly engaged in the preparation of high-strength titanium alloy material, the development of new Al-Li alloy materials, the hot rolling structure control and prediction, spinning process and technology of high-strength and high toughness aluminum alloy, etc. He has published nearly 80 academic papers. Beside, he earned many research achievements, including a first prize, four se-cond prizes and two third prizes of provincial and ministerial level scientific and technological progress.

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	LIU Jingxuan
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	LI Xiwu
	YAN Lizhen
	YAN Hongwei
	LIU Hongwei
	WEN Kai
	LI Yanan

Cite this article:

LIU Jingxuan,SHEN Jian,LI Xiwu, et al. Microstructure and Fatigue Properties of Friction Stir Welded 6005A-T5 Aluminum Alloy[J]. Materials Reports, 2021, 35(2): 2092-2097.

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http://www.mater-rep.com/EN/10.11896/cldb.20030110 OR http://www.mater-rep.com/EN/Y2021/V35/I2/2092

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