铝铜异种材料搅拌摩擦焊接接头微观组织与性能

doi:10.11896/cldb.18050184

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Abstract The dissimilar joint of 6061-T6 aluminum alloy and pure copper were successfully carried out by friction stir welding (FSW) in this work. The results showed that high-quality welded joint can be obtained when the pure copper was placed at the retreating side, and stir pin was placed 0.5 mm offset the aluminum alloy. The regional lamellar structure was formed in terms of intensive metal flow of aluminum alloy and pure copper at the joint interface. In addition, the grains were refined in the nugget zone. Several intermetallic compounds like Al₂Cu, AlCu and Al₄Cu₉ were generated in the joint, presenting a formation mechanism of solid-state diffusion. Additionally, the homogeneity of microstructure and intermetallic compounds exhibited a great impact on the distribution of microhardness. The lowest hardness was located at the heat affected zone of the aluminum alloy side, showing the effect of thermal softening. The ultimate tensile strength of the joint reached 75.5% of that of pure copper. The fracture position was located in the heat affected zone of aluminum alloy side, and the tensile fracture surface featured the mixed ductile-brittle fracture.

Key words： friction stir welding aluminum-copper dissimilar materials microstructure mechanical properties

Published: 31 May 2019

CLC number:

TG456

Fund:This work was financially supported by the National Natural Science Foundation of China (U1760201, 51574192).

About author:: Qiang Mengreceived his Ph.D. degree from University of Science and Technology Beijing in 2009. He is currently a general manager of AVIC Beijing FSW Technology Co. Ltd, a senior engineer of aviation manufacturing technology research institute of China, and an adjunct professor in Harbin Institute of Technology (Weihai). He is mainly engaged in FSW and FSP of aviation metal materials.

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	MENG Qiang
	CHE Qianying
	WANG Kuaishe
	ZHANG Kun
	WANG Wen
	HUANG Liying
	PENG Pai
	QIAO Ke

Cite this article:

MENG Qiang,CHE Qianying,WANG Kuaishe, et al. Microstructure and Mechanical Properties of Dissimilar Joint of Aluminium Alloy and Pure Copper by Friction Stir Welding[J]. Materials Reports, 2019, 33(12): 2030-2034.

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http://www.mater-rep.com/EN/10.11896/cldb.18050184 OR http://www.mater-rep.com/EN/Y2019/V33/I12/2030

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