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Damping behavior of 6061Al/Gr metal matrix composites

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Abstract

The damping behavior of graphite particulate-reinforced 6061A1 alloy metal matrix composites (MMCs) processed by spray atomization and codeposition is studied. Four spray deposition experiments are made, yielding materials with graphite volume fractions of 0, 0.05, 0.07, and 0.10. A dynamic mechanical thermal analyzer is used to measure the damping capacity and elastic modulus at 0.1, 1, and 10 Hz over the temperature range of 30 °C to 250 °C. The damping capacity of the materials is shown to increase with increasing volume fraction of graphite. Hot extrusion of the spray-deposited MMCs is shown to further increase the damping capacity. The elastic moduli of the spray-deposited MMCs are reduced with the addition of graphite but are improved by hot extrusion. At low temperatures (below 150 °C), the high damping capacity of the MMCs is attributed primarily to thermal expansion mismatch-induced dislocations and the high intrinsic damping of graphite. At high temperatures (above approximately 200 °C), the damping capacity is attributed to Al/graphite interface viscosity, preferred orientation of the graphite, and the presence of dislocations.

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, University of California-Irvine, 92717, Irvine, CA

    R. J. Perez (Graduate Student Researcher), J. Zhang (Graduate Student Researcher) & E. J. Lavernia (Associate Professor)

  2. Department of Advanced Materials Technology, Westinghouse Science and Technology Center, Westinghouse Electric Corporation, 15235, Pittsburgh, PA

    M. N. Gungor (Senior Engineer)

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  1. R. J. Perez
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  2. J. Zhang
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  3. M. N. Gungor
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  4. E. J. Lavernia
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Perez, R.J., Zhang, J., Gungor, M.N. et al. Damping behavior of 6061Al/Gr metal matrix composites. Metall Trans A 24, 701–712 (1993). https://doi.org/10.1007/BF02656638

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