Deformation characteristics and microstructural evolution in friction stir welding of thick 5083 aluminum alloy

Imam, Murshid and Sun, Yufeng and Fujii, Hidetoshi and MA, Ninshu and Tsutsumi, Seiichiro and Ahmed, Shuja and Chinthapenta, Viswanath and Murakawa, Hidekazu (2018) Deformation characteristics and microstructural evolution in friction stir welding of thick 5083 aluminum alloy. International Journal of Advanced Manufacturing Technology. ISSN 0268-3768

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The microstructure development in the weld key-hole along the plate thickness was investigated through scanning electron microscope (SEM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM) techniques. A fundamental understanding of the contact condition at the tool/workpiece interface in a TriflatTM designed friction stir welding (FSW) tool is presented. The development of grain structure for “stop-action” weld reveals that the plasticized material undergoes complex interacting flows due to the presence of threads and flats. The localized high material velocities induce a significant increase in the strain rate within thread space and thereby tune the Zener-Hollomon parameter. An interesting analogy is drawn between the evolution of the secondary shear zone (SSZ) in a typical metal cutting and the steady state FSW processes. The presence of different morphology of the material filling the thread space is linked to the local variation of the contact state variables along weld thickness. It was found that the contact state is governed by the intrinsic interface characteristics and the mechanical property of the material. It was also shown that the presence of larger particles (> 0.5 μm) is responsible for the formation of high angle boundaries (HAGBs) and random recrystallization texture within the stir zone, reflecting random grain orientation due to particle-stimulated nucleation (PSN).

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IITH Creators:
IITH CreatorsORCiD
Chinthapenta, ViswanathUNSPECIFIED
Item Type: Article
Uncontrolled Keywords: Friction stir welding, Particle-stimulated nucleation, Stop-action weld, Deformation state, Weld key-hole
Subjects: Others > Mechanics
Divisions: Department of Mechanical & Aerospace Engineering
Depositing User: Team Library
Date Deposited: 23 Aug 2018 09:22
Last Modified: 23 Aug 2018 09:22
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