7050铝合金搅拌摩擦焊接头的微观织构演变与力学性能

doi:10.11896/cldb.19100068

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Abstract The microtexture evolution, hardness distribution and tensile properties of the friction stir welded joint of 7050 aluminum alloy with a thickness of 5 mm were studied and compared with the tensile properties of the complete welded joints. The results show that the base metal is mainly for the substructure, with (011) [100] Goss texture, (112) [$11\bar{1}$] copper texture and (001) [100] Cube texture. Dynamic recrystallization occurred in the weld nugget zone, mainly existing in [100]//WD, [110]//WD, [111]//WD fiber texture. There are (111) [$\bar{1}10$] shear texture, (110) [$\bar{1}12$] brass texture, (100) [$01\bar{2}$] and (100) [012] recrystallization texture in the thermos- mechanically affected zone of advancing side; the thermo-mechanically affected zone of retreating side is (001) [110] rotating cubic recrystallization texture and (112) [$11\bar{1}$] copper texture, mainly due to different thermal-mechanical action in each microzone. The hardness of the weld zone is “W” type distribution, and the lo-west hardness is located in the heat-affected zone of retreating side. The tensile strength of the advancing side and the retreating side of the weld is 496.9 MPa and 505.2 MPa, respectively, reaching 88% and 90% of the tensile strength of the base metal. The tensile strength of the weld nugget zone is 440.4 MPa. The tensile strength of the complete welded joints is the lowest, 415.7 MPa.

Key words： 7050 aluminum alloy friction stir weld electron backscattered diffraction(EBSD) tensile property

Published: 06 November 2020

CLC number:

TG453

Fund:National Natural Science Foundation of China (51865028).

About author:: Yuhua Jin, associate professor, Lanzhou University of Technology, the main research fields include non-ferrous metal and its alloy friction stir welding joint mec-hanism research, nickel base alloy melting, high temperature resistance performance research and surface modification technology research. In recent years, she published more than 30 articles in important journals.

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	JIN Yuhua
	ZHANG Lin
	ZHANG Liangliang
	WANG Xijing

Cite this article:

JIN Yuhua,ZHANG Lin,ZHANG Liangliang, et al. Microtexture Evolution and Mechanical Properties of Friction Stir Welded 7050 Aluminum Alloy[J]. Materials Reports, 2020, 34(20): 20107-20111.

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http://www.mater-rep.com/EN/10.11896/cldb.19100068 OR http://www.mater-rep.com/EN/Y2020/V34/I20/20107

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