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The balance of mechanical and environmental properties of a multielement niobium-niobium silicide-basedIn Situ composite

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Abstract

This article describes room-temperature and high-temperature mechanical properties, as well as oxidation behavior, of a niobium-niobium silicide basedin situ composite directionally solidified from a Nb-Ti-Hf-Cr-Al-Si alloy. Room-temperature fracture toughness, high-temperature tensile strength (up to 1200 °C), and tensile creep rupture (1100 °C) data are described. The composite shows an excellent balance of high- and low-temperature mechanical properties with promising environmental resistance at temperatures above 1000 °C. The composite microstructures and phase chemistries are also described. Samples were prepared using directional solidification in order to generate an aligned composite of a Nb-based solid solution with Nb3Si- and Nb5Si3-type silicides. The high-temperature mechanical properties and oxidation behavior are also compared with the most recent Ni-based superalloys. This composite represents an excellent basis for the development of advanced Nb-based intermetallic matrix composites that offer improved properties over Ni-based superalloys at temperatures in excess of 1000 °C.

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Authors and Affiliations

  1. the Corporate Research and Development Center, General Electric Company, 1230, Schenectady, NY

    B. P. Bewlay (Staff Metallurgist) & M. R. Jackson (Staff Metallurgist)

  2. the Department of Mechanical and Materials Engineering, Wright State University, 45435, Dayton, OH

    H. A. Lipsitt (Professor)

Authors
  1. B. P. Bewlay
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  2. M. R. Jackson
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  3. H. A. Lipsitt
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Bewlay, B.P., Jackson, M.R. & Lipsitt, H.A. The balance of mechanical and environmental properties of a multielement niobium-niobium silicide-basedIn Situ composite. Metall Mater Trans A 27, 3801–3808 (1996). https://doi.org/10.1007/BF02595629

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  • DOI: https://doi.org/10.1007/BF02595629

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