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Infiltration of fiber preforms by an Alloy: Part III. Die Casting Experiments

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Abstract

Preforms of 20 vol pct SAFFIL alumina fibers are infiltrated with Al-4.4 wt pct Cu-0.3 wt pct Mg using a horizontal die casting machine. Fiber preform temperature is varied from 973 to 673 K. Solute distribution, fiber volume fraction, and matrix microstructure are characterized using optical metallography and electron microprobe analysis. Increases in fiber volume fraction are observed in the composites downstream of the infiltration path. We propose that these result from locking of the compressed fibers by solid metal present during infiltration. With this as- sumption, we find good agreement between theory presented in Parts I [1] and II [2] for solute concentration, fiber volume fraction distributions, as well as matrix microstructure and exper- iments. With an initial preform temperature of 673 K, freckles are found in the composite, which are interpreted to result from the combined effects of pressure and significant enrichment in solute at the infiltration front.

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Authors and Affiliations

  1. Centre de Recherches Pechiney, 38340, Voreppe, France

    P. Jarry (Research Engineer), A. Dubus (Research Engineer) & R. Tirard-Collet (Research Engineer)

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

    V. J. Michaud (Postdoctoral Research Associate) & A. Mortensen (Associate Professor)

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  1. P. Jarry
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  2. V. J. Michaud
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  3. A. Mortensen
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  4. A. Dubus
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  5. R. Tirard-Collet
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Jarry, P., Michaud, V.J., Mortensen, A. et al. Infiltration of fiber preforms by an Alloy: Part III. Die Casting Experiments. Metall Trans A 23, 2281–2289 (1992). https://doi.org/10.1007/BF02646021

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