Investigation of Interfacial Layer for Friction Stir Scribe Welded Aluminum to Steel Joints

Wang, Kaifeng; Upadhyay, Piyush; Wang, Yuxiang; Li, Jingjing; Sun, Xin; Roosendaal, Timothy J.

doi:10.1115/1.4040873

Title: Investigation of Interfacial Layer for Friction Stir Scribe Welded Aluminum to Steel Joints

Journal Article · Thu Nov 01 00:00:00 EDT 2018 · Journal of Manufacturing Science and Engineering

DOI:https://doi.org/10.1115/1.4040873· OSTI ID:1572663

Wang, Kaifeng ^[1]; Upadhyay, Piyush ^[2]; Wang, Yuxiang ^[1]; Li, Jingjing ^[1]; Sun, Xin ^[3]; Roosendaal, Timothy J. ^[2]

Pennsylvania State University
BATTELLE (PACIFIC NW LAB)
Oak Ridge National Laboratory

Friction stir scribe (FSS) welding as a recent derivative of friction stir welding has successfully fabricated a linear joint between automotive Al and steel sheets. However, there is a lack of understanding on its bonding mechanism. In this paper, the microstructures and phases at the bonding interface of FSS welded Al to ultra-high strength steel joints were studied using scanning electron microscopy and transmission electron microscopy. Based on the microstructural analysis, it is found that both mechanical and chemical bonding occurred simultaneously, and the energy-dispersive X-ray spectroscopy revealed that a thin intermetallic compound (IMC) layer was formed at the interface. Owing to the varied material flow and heat generation, the IMC layer thickness gradually decreased from the advancing side to the retreating side, and two IMCs (i.e. Fe2Al5 and Fe4Al13) were confirmed in different weld regions using diffraction pattern (or 1D fast Fourier transform pattern). Also, a Fe/Al solid solution was noticed in the IMC layer, and several Al fringes were found in the Fe-rich side in the scribe stir zone.

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Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1572663

Report Number(s):: PNNL-SA-131371

Journal Information:: Journal of Manufacturing Science and Engineering, Vol. 140, Issue 11

Country of Publication:: United States

Language:: English

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