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Interfaces in nickel aluminide/alumina fibre composites

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Abstract

Metal matrix composites based on the intermetallic alloy Ni3Al and fibres of Al2O3 were fabricated by hot-pressing nickel aluminide powders and alumina fibres. Two matrix alloys were used in this investigation: Ni3Al microalloyed with boron and Ni3Al alloyed with 8 at% chromium and smaller amounts of zirconium and boron. The materials were studied using optical and transmission electron microscopy with particular emphasis placed on the characteristics of the matrix-fibre interface. The base Ni3Al/Al3O3 composite displayed no evidence of chemical reaction at the interface, an intimate bond between matrix and fibre was observed, and the material exhibited 10% ductility at room temperature. Composites with the more complex matrix alloy were brittle, a phenomenon attributed to the formation of zirconia particles at the interface.

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Author notes

  1. G. L. Povirk

    Present address: Brown University, 02912, Providence, Rhode Island, USA

Authors and Affiliations

  1. Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA

    G. L. Povirk, J. A. Horton, C. G. McKamey & T. N. Tiegs

  2. Brown University, 02912, Providence, Rhode Island, USA

    S. R. Nutt

Authors
  1. G. L. Povirk
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  2. J. A. Horton
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  3. C. G. McKamey
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  4. T. N. Tiegs
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  5. S. R. Nutt
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Povirk, G.L., Horton, J.A., McKamey, C.G. et al. Interfaces in nickel aluminide/alumina fibre composites. J Mater Sci 23, 3945–3950 (1988). https://doi.org/10.1007/BF01106818

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  • DOI: https://doi.org/10.1007/BF01106818

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