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The influence of matrix microstructure and particle reinforcement on the creep behavior of 2219 aluminum

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Abstract

The influence of matrix microstructure and reinforcement with 15 vol pct of TiC particles on the creep behavior of 2219 aluminum has been examined in the temperature range of 150 ‡C to 250 ‡C. At 150 ‡C, reinforcement led to an improvement in creep resistance, while at 250 ‡C, both materials exhibited essentially identical creep behavior. Precipitate spacing in the matrix exerted the predominant influence on minimum creep rate in both the unreinforced and the reinforced materials over the temperature range studied. This behavior and the high-stress dependence of minimum creep rate are explained using existing constant structure models where, in the present study, precipitate spacing is identified as the pertinent substructure dimension. A modest microstructure-independent strengthening from particle reinforcement was observed at 150 ‡C and was accurately modeled by existing continuum mechanical models. The absence of reinforcement creep strengthening at 250 ‡C can be attributed to diffusional relaxation processes at the higher temperature.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Michigan, 48109, Ann Arbor, MI

    P. E. Krajewski (Graduate Student) & J. W. Jones (Professor)

  2. Materials Science Department, Ford Research Laboratory, Ford Motor Company, 48124, Dearborn, MI

    J. E. Allison (Staff Scientist)

Authors
  1. P. E. Krajewski
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  2. J. E. Allison
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  3. J. W. Jones
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Krajewski, P.E., Allison, J.E. & Jones, J.W. The influence of matrix microstructure and particle reinforcement on the creep behavior of 2219 aluminum. Metall Trans A 24, 2731–2741 (1993). https://doi.org/10.1007/BF02659497

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