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Processing and creep characterization of a model metal matrix composite: Lead reinforced with nickel fibers

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Abstract

A metal matrix composite material consisting of short nickel fibers in a lead matrix has been produced by foil lamination and press bonding. A good degree of fiber alignment has been achieved by passing the laminate through a weak magnetic field prior to press bonding. Tension creep tests of the composite material were conducted in the temperature range of 423 to 523 K (150 °C to 250 °C). The steady-state creep rate was seen to depend strongly on stress and temperature. The measured stress exponent for the steady-state creep rate is 9.9 over the range of test temperatures. The creep activation energy for the composite is calculated to be 152 kJ/mol. Analysis of the fracture surfaces of the composite shows that the composite fails by debonding at the interface and by void formation in the matrix. Simple continuum mechanics modeling of the creep of this composite gives qualitative agreement with the experimental results in the steady state but falls short of accurately predicting the steady-state creep rate.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Stanford University, 94305-2205, Stanford, CA

    T. L. Dragone (Graduate Research Assistant) & W. D. Nix (The Lee Otterson Professor of Engineering)

  2. Materials Science Department, San Jose State University, 95192, San Jose, CA

    J. J. Schlautmann

Authors
  1. T. L. Dragone
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  2. J. J. Schlautmann
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  3. W. D. Nix
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Dragone, T.L., Schlautmann, J.J. & Nix, W.D. Processing and creep characterization of a model metal matrix composite: Lead reinforced with nickel fibers. Metall Trans A 22, 1029–1036 (1991). https://doi.org/10.1007/BF02661096

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  • DOI: https://doi.org/10.1007/BF02661096

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