Microstructure and Mechanical Property of Friction Stir Weld Joints of Dissimilar Al-alloys 5083 and 6061

doi:10.11901/1005.3093.2017.634

Chinese Journal of Materials Research

2018, Vol. 32

Issue (6): 473-480 DOI: 10.11901/1005.3093.2017.634

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Microstructure and Mechanical Property of Friction Stir Weld Joints of Dissimilar Al-alloys 5083 and 6061

Hongliang WANG¹, Xianghao ZENG^2,³, Xinmeng ZHANG¹, Qiao SHANG², Peng XUE²(

), Dingrui NI², Zongyi MA²

1 CRRC Changchun Railway Vehicles Co., Ltd., Changchun 130062, China
2 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3 University of Chinese Academy of Sciences, Beijing 100049, China

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Hongliang WANG, Xianghao ZENG, Xinmeng ZHANG, Qiao SHANG, Peng XUE, Dingrui NI, Zongyi MA. Microstructure and Mechanical Property of Friction Stir Weld Joints of Dissimilar Al-alloys 5083 and 6061. Chinese Journal of Materials Research, 2018, 32(6): 473-480.

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Abstract

Sheets of Al-alloys 5083 and 6061 of 6 mm in thickness were subjected to friction stir welding (FSW) with different welding parameters. The effect of welding parameters on the microstructure and mechanical property of the FSW joints were investigated. Results show that FSW joints with high quality could be produced by controlling welding parameters, and a high joint strength coefficient of 85% was obtained. Dynamic recrystallization took place in the nugget zones (NZs) with fine and equiaxed grains generated, and the grain size increased with the increasing rotation rate; usually the grain size of 5083 Al in the NZ was smaller than that of 6061Al. The heat-affected zones (HAZ) of 6061 Al side were the low hardness zones in all of the FSW joints, and the value of low hardness increased with the increasing rotation rate. It is found that the fracture paths corresponded well with the lowest hardness distribution profiles in the joints and the ultimate tensile strength increased with the increasing of the rotation rate.

Key words: Al alloys friction stir welding microstructure mechanical property

Received: 23 October 2017

ZTFLH:

TG457

Fund: Supported by National Natural Science Foundation of China (Nos. 51331008 & U1760201)

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	Hongliang WANG
	Xianghao ZENG
	Xinmeng ZHANG
	Qiao SHANG
	Peng XUE
	Dingrui NI
	Zongyi MA

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.634 OR https://www.cjmr.org/EN/Y2018/V32/I6/473

Table 1 Chemical composition of 5083 and 6061Al alloys (mass fraction, %)

Fig.1 Microstructure of various FSW joints (a) 400-100, (b) 800-100, (c) 1200-100;(d) 1600-100; (e) 2000-100; (NZ—nugget zone, TMAZ—thermo-mechanically affected zone, HAZ—heat-affected zone, AS—advancing side, RS—retreating side)

Fig.2 Microstructure of various FSW joints in different zones: the NZ in (a) 400-100; (b) 1200-100; (c) 2000-100;the TMAZ of advancing side (AS) in (d) 400-100; (e) 1200-100;(f) 2000-100; the HAZ of AS in (g) 400-100; (h) 1200-100; (i) 2000-100

Fig.4 Grain size of 5083 and 6061Al in NZ under various parameters

Fig.5 Typical bright-field TEM images of the 6061Al and the HAZs of AS in the FSW joints (a) 6061Al, (b) 400-100, (c) 1200-100, (d) 2000-100

Fig.6 Microhardness profiles of the FSW joints under various parameters

Table 2 Tensile property of BM and dissimilar FSW joints under various parameters at room temperature

Fig.7 Samples of various FSW joints after tensile test (a, b) 400-100, (c, d) 800-100, (e, f) 1200-100, (g, h) 1600-100, (i, j) 2000-100

Fig.8 Fractographs of the dissimilar FSW joints (a) fracture macroscopic photograph of sample 400-100, (b) SEM photograph of sample 400-100, (c) fracture in sample 400-100;(d) the crack in the NZ of sample 2000-100

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