Ultrahigh-Temperature Nb-Silicide-Based Composites

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. Pre...

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Bibliographic Details
Published in:MRS bulletin 2003-09, Vol.28 (9), p.646-653
Main Authors: Bewlay, B. P., Jackson, M. R., Zhao, J.-C., Subramanian, P. R., Mendiratta, M. G., Lewandowski, J. J.
Format: Article
Language:English
Subjects:
casting
composites
creep
extrusion
fatigue
jet engines
Nb silicide
niobium
oxidation
superalloys
Technical Feature
turbines
ultrahigh-temperature materials
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Summary: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 room-temperature 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.
ISSN:0883-7694
1938-1425
DOI:10.1557/mrs2003.192