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

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

Research output: Contribution to journalArticle

Abstract

Friction stir scribe (FSS) welding as a recent derivative of friction stir welding (FSW) has been successfully used to fabricate a linear joint between automotive Al and steel sheets. It has been established that FSS welding generates a hook-like structure at the bimaterial interface. Beyond the hook-like structure, there is a lack of fundamental understanding on the bond formation mechanism during this newly developed FSS welding process. In this paper, the microstructures and phases at the joint interface of FSS welded Al to ultra-high-strength steel were studied using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It was found that both mechanical interlocking and interfacial bonding occurred simultaneously during the FSS welding process. Based on SEM observations, a higher diffusion driving force in the advancing side was found compared to the retreating side and the scribe swept zone, and thermally activated diffusion was the primary driving force for the interfacial bond formation in the scribe swept region. The TEM energy-dispersive X-ray spectroscopy (EDXS) revealed that a thin intermetallic compound (IMC) layer was formed through the interface, where the thickness of this layer gradually decreased from the advancing side to the retreating side owing to different material plastic deformation and heat generations. In addition, the diffraction pattern (or one-dimensional fast Fourier transform (FFT) pattern) revealed that the IMC layer was composed of Fe2Al5 or Fe4Al13 with a Fe/Al solid solution depending on the weld regions.

Original languageEnglish (US)
Article number111005
JournalJournal of Manufacturing Science and Engineering, Transactions of the ASME
Volume140
Issue number11
DOIs
StatePublished - Nov 1 2018

Fingerprint

Friction stir welding
Friction
Aluminum
Steel
Hooks
Intermetallics
Transmission electron microscopy
Scanning electron microscopy
Heat generation
Steel sheet
High strength steel
Fast Fourier transforms
Diffraction patterns
Solid solutions
Plastic deformation
Welds
Derivatives
Microstructure

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Mechanical Engineering
  • Computer Science Applications
  • Industrial and Manufacturing Engineering

Cite this

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title = "Investigation of Interfacial Layer for Friction Stir Scribe Welded Aluminum to Steel Joints",
abstract = "Friction stir scribe (FSS) welding as a recent derivative of friction stir welding (FSW) has been successfully used to fabricate a linear joint between automotive Al and steel sheets. It has been established that FSS welding generates a hook-like structure at the bimaterial interface. Beyond the hook-like structure, there is a lack of fundamental understanding on the bond formation mechanism during this newly developed FSS welding process. In this paper, the microstructures and phases at the joint interface of FSS welded Al to ultra-high-strength steel were studied using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It was found that both mechanical interlocking and interfacial bonding occurred simultaneously during the FSS welding process. Based on SEM observations, a higher diffusion driving force in the advancing side was found compared to the retreating side and the scribe swept zone, and thermally activated diffusion was the primary driving force for the interfacial bond formation in the scribe swept region. The TEM energy-dispersive X-ray spectroscopy (EDXS) revealed that a thin intermetallic compound (IMC) layer was formed through the interface, where the thickness of this layer gradually decreased from the advancing side to the retreating side owing to different material plastic deformation and heat generations. In addition, the diffraction pattern (or one-dimensional fast Fourier transform (FFT) pattern) revealed that the IMC layer was composed of Fe2Al5 or Fe4Al13 with a Fe/Al solid solution depending on the weld regions.",
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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.

In: Journal of Manufacturing Science and Engineering, Transactions of the ASME, Vol. 140, No. 11, 111005, 01.11.2018.

Research output: Contribution to journalArticle

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T1 - Investigation of Interfacial Layer for Friction Stir Scribe Welded Aluminum to Steel Joints

AU - Wang, Kaifeng

AU - Upadhyay, Piyush

AU - Wang, Yuxiang

AU - Li, Jingjing

AU - Sun, Xin

AU - Roosendaal, Timothy

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