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Ultrahigh-Temperature Nb-Silicide-Based Composites

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Abstract

This article reviews the most recent progress in the development of Nb-silicide-based in situ composites for potential applications in turbine engines with service temperatures of up to 1350°C. These composites contain high-strength Nb silicides that are toughened by a ductile Nb solid solution. Preliminary composites were derived from binary Nb-Si alloys, while more recent systems are complex and are alloyed with Ti, Hf, W, B, Ge, Cr, and Al. Alloying schemes have been developed to achieve an excellent balance of roomtemperature toughness, fatigue-crack-growth behavior, high-temperature creep performance, and oxidation resistance over a broad range of temperatures. Nb-silicide-based composites are described with emphasis on processing, microstructure, and performance. Nb silicide composites have been produced using a range of processing routes, including induction skull melting, investment casting, hot extrusion, and powder metallurgy methods. Nb silicide composite properties are also compared with those of Ni-based superalloys.

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Authors
  1. B. P. Bewlay
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  2. M. R. Jackson
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  3. J. C. Zhao
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  4. P. R. Subramanian
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  5. M. G. Mendiratta
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  6. J. J. Lewandowski
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Bewlay, B.P., Jackson, M.R., Zhao, J.C. et al. Ultrahigh-Temperature Nb-Silicide-Based Composites. MRS Bulletin 28, 646–653 (2003). https://doi.org/10.1557/mrs2003.192

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