The microstructure and mechanical properties of ultrasonically welded AA6111-T4 specimens are discussed. The effects of welding time on the mechanical properties of welded joints are investigated. A longer welding time results in a more continuous welded interface and higher yield and fracture strengths. Accordingly, fatigue properties of the welded specimens with longer welding times are improved. The results of electron microscopy on the cross section of ultrasonically welded joints show three distinct zones: weld zone, weld affected zone and compression zone each with a distinct microstructure. TEM results show nanocrystalline grains along with second phase particles in the range of 15–25 nm in the weld zone. Flow patterns consistent with the geometry of weld–tip were observed at the weld interface.
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January 2005
Technical Papers
Microstructural Characterization of Ultrasonically Welded Aluminum
S. M. Allameh,
S. M. Allameh
Department of Technology, Northern Kentucky University, Highland Heights, KY 41076
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C. Mercer,
C. Mercer
Materials Department, University of California at Santa Barbara
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W. O. Soboyejo
W. O. Soboyejo
Princeton Materials Institute and The Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544
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S. M. Allameh
Department of Technology, Northern Kentucky University, Highland Heights, KY 41076
C. Mercer
Materials Department, University of California at Santa Barbara
D. Popoola
Zimmer, Inc., Warsaw, IN 46581
W. O. Soboyejo
Princeton Materials Institute and The Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544
Manuscript received January 1, 2003; revision received September 14, 2004. Review conducted by: H. Sehitoglu.
J. Eng. Mater. Technol. Jan 2005, 127(1): 65-74 (10 pages)
Published Online: February 22, 2005
Article history
Received:
January 1, 2003
Revised:
September 14, 2004
Online:
February 22, 2005
Citation
Allameh, S. M., Mercer, C., Popoola, D., and Soboyejo, W. O. (February 22, 2005). "Microstructural Characterization of Ultrasonically Welded Aluminum ." ASME. J. Eng. Mater. Technol. January 2005; 127(1): 65–74. https://doi.org/10.1115/1.1836792
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