Effect of Artificial Aging on Microstructure and Mechanical Properties of Friction Stir Welded Joint of 7003/7046 Al-alloys

doi:10.11901/1005.3093.2019.477

Chinese Journal of Materials Research

2020, Vol. 34

Issue (7): 495-504 DOI: 10.11901/1005.3093.2019.477

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Effect of Artificial Aging on Microstructure and Mechanical Properties of Friction Stir Welded Joint of 7003/7046 Al-alloys

YANG Meng¹^,², LI Chengbo¹^,²^,³, LIU Shengdan¹^,⁴(

), YE Lingying¹^,², TANG Jianguo¹^,², LIAO Zexin¹^,²

1.School of Materials Science and Engineering, Central South University, Changsha 410083, China
2.Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China
3.Guangdong Hoshion Industrial Aluminium Co. Ltd. , Zhongshan 528463, China
4.National Key Laboratory of Science and Technology for National Defence on High Strength Structural Materials, Central South University, Changsha 410083, China

Cite this article:

YANG Meng, LI Chengbo, LIU Shengdan, YE Lingying, TANG Jianguo, LIAO Zexin. Effect of Artificial Aging on Microstructure and Mechanical Properties of Friction Stir Welded Joint of 7003/7046 Al-alloys. Chinese Journal of Materials Research, 2020, 34(7): 495-504.

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Abstract

The effect of post-weld artificial aging on microstructure and mechanical properties of friction stir welded (FSW) joint of 7003-7046 dissimilar Al-alloys was investigated by means of differential scanning calorimetry, hardness test, room temperature tensile test, backscattered electron diffraction and transmission electron microscopy. The results show that the hardness is significantly higher on the retreating side (7046 Al-alloy side) than that of the advancing side (7003 Al-alloy side), and the average hardness difference between the two sides is about 30HV; After artificial aging, the hardness increases, the yield strength increases significantly, the tensile strength increases slightly, and the elongation has little change of the joint, while the hardness difference increases to about 50HV for the two sides. The reason has been discussed based on the microstructure of different regions of the FSW joint before and after artificial aging treatment.

Key words: Al alloy friction stir welding post weld heat treatment microstructure mechanical property

Received: 15 October 2019

ZTFLH:

TG146

Fund: National Key Research and Development Program of China(2016YFB0300901);Key Project of Science and Technology of Zhongshan Bureau of Guangdong Province(2016A1001)

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	Meng YANG
	Chengbo LI
	Shengdan LIU
	Lingying YE
	Jianguo TANG
	Zexin LIAO

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.477 OR https://www.cjmr.org/EN/Y2020/V34/I7/495

Table 1 Chemical compotent of 7003 and 7046 Al alloys (mass fraction, %)

Fig.1 Schematic of hardness tests and tensile specimens prepared from the FSW joint (ND: normal direction of the base alloy, ED: extrusion direction of the base alloy, TD: transverse direction of the base alloy)

Fig.2 Macrostructure appearance of 7003-7046 dissimilar aluminum alloy FSW joint

Fig.3 Grain orientation maps in ND -TD section of BM zones (a) position g in Fig.2, (b) position h in Fig.2

Fig.4 Grain orientation maps in ND-TD section of NZ、HAZ and TMAZ zones in AW joint (a) position a in Fig.2, (b) position b in Fig.2, (c) position c in Fig.2, (d) position d in Fig.2, (e) position e in Fig.2, (f) position f in Fig.2

Fig.5 TEM images and corresponding SADP of NZ zones (a) NZ of AW joint-7003, (b) NZ of AA joint-7003, (c) NZ of AW joint-7046, (d) NZ of AA joint-7046

Fig.6 TEM images and the typical SADP of different zones on AS AW joint: (a) TMAZ, (b) HAZ, (c) BM, (d) SADP of BM, AA joint: (e) TMAZ, (f) HAZ, (g) BM, (h) SADP of BM

Fig.7 TEM images and the typical SADP of different zones on RS AW joint: (a) TMAZ, (b) HAZ, (c) BM, (d) SADP of BM, AA joint: (e) TMAZ, (f) HAZ, (g) BM, (h) SADP of BM

Fig.8 DSC curves of AS zones before and after artificial aging (a) AW joint, (b) AA joint

Table 2 Precipition phase peak area of all zones before and after artificial aging

Fig.9 DSC curves of RS zones before and after artificial aging (a) AW joint, (b) AA joint

Fig.10 Micro-hardness profiles of the AW joint and AA joint

Table 3 Tensile property of BM and FSW joints before or after artificial aging at room temperature

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