MICROSTRUCTURE CHANGE AND ENERGY RELEASE OF FRICTION STIR WELDED Al-Mg-Si ALLOY DURING DSC TEST

doi:10.3724/SP.J.1037.2013.00419

Acta Metall Sin

2014, Vol. 50

Issue (5): 587-593 DOI: 10.3724/SP.J.1037.2013.00419

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MICROSTRUCTURE CHANGE AND ENERGY RELEASE OF FRICTION STIR WELDED Al-Mg-Si ALLOY DURING DSC TEST

DAI Qilei¹, LIANG Zhifang², WU Jianjun¹, MENG Lichun³, SHI Qingyu¹(

)

1 Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Department of Mechanical Engineering, Tsinghua University, Beijing 100084
2 Fundamental Industrial Training Center, Tsinghua University, Beijing 100084
3 CSR Sifang Locomotive and Rolling Stock Co. Ltd., Qingdao 266000

Cite this article:

DAI Qilei, LIANG Zhifang, WU Jianjun, MENG Lichun, SHI Qingyu. MICROSTRUCTURE CHANGE AND ENERGY RELEASE OF FRICTION STIR WELDED Al-Mg-Si ALLOY DURING DSC TEST. Acta Metall Sin, 2014, 50(5): 587-593.

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Abstract

During friction stir welding, the nugget zone (NZ) underwent severe plastic deformation and high temperature. This process resulted in high density of dislocations and dissolving of the precipitation. In this study, the stored energy of the NZ in friction stir welded Al-Mg-Si joint was quantitatively analyzed by means of differential scanning calorimetry (DSC). The microstructure of the NZ was investigated by electron back scattering diffraction (EBSD) and transmission electron microscope (TEM). DSC analysis showed that the energy stored in the NZ was about 8.565 J/g. Microstructure investigation showed that the NZ was composed of low-angle grain boundary (42%) and high-angle grain boundary (58%). Meanwhile, there were high density dislocations in the NZ. The stored energy was quantitatively analyzed based on EBSD data and dislocation density. The results showed that the stored energy resulting from the grain boundary and dislocations was about 0.0247 J/g and 0.0712 J/g, respectively. These results proved that the precipitation played dominant role in stored energy while the contribution of grain boundary and dislocations are negligible.

Key words: friction stir welding (FSW) electron back scattering diffraction (EBSD) stored energy Al-Mg-Si alloy differential scanning calorimetry (DSC)

Received: 17 July 2013

ZTFLH:

TG113

Fund: Supported by National Natural Science Foundation of China (No.51375259)

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	Qilei DAI
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	Qingyu SHI

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00419 OR https://www.ams.org.cn/EN/Y2014/V50/I5/587

Fig.1

Al-Mg-Si合金FSW接头宏观和微观组织

Fig.2

Al-Mg-Si合金FSW接头NZ和母材的DSC曲线

Fig.3

Al-Mg-Si合金FSW接头NZ的EBSD图

Fig.4

Al-Mg-Si合金FSW接头NZ组织取向差和亚晶粒大小分布

Fig.5

Al-Mg-Si合金FSW接头NZ晶粒内的位错结构

Fig.6

NZ-H的DSC曲线

Fig.7

NZ-H的EBSD 图

Fig.8

NZ-H的组织取向差和亚晶粒尺寸分布

Fig.9

NZ-H的TEM像

Fig.10

焊态和快速加热下接头的硬度分布

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