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Structure and room-temperature deformation of alumina fiber-reinforced aluminum

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Abstract

Plastic deformation under uniaxial longitudinal tension and compression is investigated for pure aluminum reinforced with a high volume fraction of parallel alumina fibers. The matrix substructure is also examined in transmission electron microscopy. The aim is to study thein situ room-temperature mechanical behavior, particularly the work-hardening rate, of pure aluminum when reinforced with a high volume fraction of chemically inert ceramic reinforcement. The matrix substructure prior to deformation, composed of cells about2 µm in diameter, is similar to that of highly deformed unreinforced aluminum. Measured compressive composite elastic moduli agree with rule of mixture predictions; however, no elastic regime is found during tensile loading. As tensile deformation proceeds above a strain around 0.05 pct, a constant rate of work hardening is reached, in which the matrix contribution is negligible within experimental error. Upon unloading from tensile straining, Bauschinger yielding begins before the composite reaches zero load, as predicted by the rule of mixtures. The matrix substructure after load reversal retains a2- µm cell size but with greater irregularity in the dislocation configurations. Using the rule of mixtures,in situ stress-strain curves are derived for the reinforced aluminum matrix and described by a modified Voce law.

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  1. Aluminium Ranshofen, Gembh, Ranshofen, Austria

    J. A. Isaacs (Research Engineer)

  2. Department of Materials Science and Engineering, Massachusetts Institute of Technology, 02139, Cambridge, MA

    A. Mortensen (Associate Professor)

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Formerly with the Department of Materials Science and Engineering, Massachusetts Institute of Technology

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Isaacs, J.A., Mortensen, A. Structure and room-temperature deformation of alumina fiber-reinforced aluminum. Metall Trans A 23, 1207–1219 (1992). https://doi.org/10.1007/BF02665052

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