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TECHNICAL PAPERS

Interfacial Structure and Micro and Nano-Mechanical Behavior of Laser-Welded 6061 Aluminum Alloy Blank

[+] Author and Article Information
N. Q. Wu, N. Perrusquia, Scott X. Mao

Department of Mechanical Engineering, University of Pittsburgh, PA 15261

Cedrix Xia

Ford Research Laboratory, Dearborn, MI 48121

Ming Li

Alcoa Technical Center, Alcoa Center, PA 15261

J. Eng. Mater. Technol 126(1), 8-13 (Jan 22, 2004) (6 pages) doi:10.1115/1.1631023 History: Received August 20, 2002; Revised February 03, 2003; Online January 22, 2004
Copyright © 2004 by ASME
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References

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Pastor,  M., Zhao,  H., Martukanitz,  R. P., and Debroy,  T., 1999, “Porosity, underfill and magnesium loss during continuous wave Nd:YAG laser welding of thin plates of aluminum alloys 5182 and 5754,” Weld. J. (Miami, FL, U. S.), 78(6), pp. 207s–216s.
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Figures

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Illustration of specimen for tensile test
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The cross-section of the weld bead for 6061/6061 blank: (a) Optical photograph of the welded blank, and (b) Schematic illustration of the four distinct zones at the welded blank.
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The height-mode AFM image showing the microstructure at the center of the fusion zone
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Microstructure near the fusion line
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Microstructure of the base 6061 alloy
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Microhardness profile across the weld bead
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Tensile stress-strain curves for 1mm 6061 base blank and the welded 6061/6061 blank
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The fracture morphology after tensile testing: (a) 6061 base material, (b) welded 6061/6061 blank, and (c) Cracks on the fracture surface of welded 6061/6061 blank.
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EDS analysis of the welded specimen, showing the Mg distribution across the fusion line
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Continuous indentation load versus displacement curve and the AFM image of indentation morphology measured from the partially melted zone
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The nanoindentation results; (a) Nanoindentations made at the partially melted zone, (b) Hardness profile obtained from the nanoindentation measurements

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