Metallurgical and Materials Transactions A

, Volume 27, Issue 12, pp 3801–3808 | Cite as

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

  • B. P. Bewlay
  • M. R. Jackson
  • H. A. Lipsitt


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.


Material Transaction Metallic Phase Silicide Phase Fracture Toughness Measurement Material Research Society Symposium Proceeding 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    R.W. Buckman, Jr.: inAlloying, J.L. Walter, M.R. Jackson, and C.T. Sims, eds., ASM INTERNATIONAL, Metals Park, OH, 1988, pp. 419–45.Google Scholar
  2. 2.
    M.R. Jackson, B.P. Bewlay, R.G. Rowe, D.W. Skelly, and H.A. Lipsitt:J. of Met., 1996, vol. 48 (1), pp. 39–46.Google Scholar
  3. 3.
    P.R. Subramanian, M.G. Mendiratta, and D.M. Dimiduk:J. Met. 1996, vol. 48 (1), pp. 33–38.Google Scholar
  4. 4.
    P.R. Subramanian, M.G. Mendiratta, and D.M. Dimiduk:Mater. Res. Soc. Symp. Proc., 1994, vol. 322, pp. 491–502.Google Scholar
  5. 5.
    D.M. Dimiduk, M.G. Mendiratta, and P.R. Subramanian: inStructural Intermetallics, R. Darolia, J.J. Lewandowski, C.T. Liu, P.L. Martin, D.B. Miracle, and M.V. Nathal eds., TMS, Warrendale, PA, 1993, pp. 619–30.Google Scholar
  6. 6.
    M.G. Mendiratta, J.J. Lewandowski, and D.M. Dimiduk:Metall. Trans. A, 1991, vol. 22A, pp. 1573–81.Google Scholar
  7. 7.
    M.G. Mendiratta and D.M. Dimiduk:Metall. Trans. A, 1993, vol. 24A, pp. 501–04.Google Scholar
  8. 8.
    J.D. Rigney, P.R. Singh, and J.J. Lewandowski:Mater. Res. Soc. Symp. Proc., 1994, vol. 322, pp. 502–09.Google Scholar
  9. 9.
    I. Weiss, M. Thirukkonda, and R. Srinivasan:Mater. Res. Soc. Symp. Proc., 1994, vol. 322, pp. 377–86.Google Scholar
  10. 10.
    B.P. Bewlay, H.A. Lipsitt, W.J. Reeder, M.R. Jackson, and J.A. Sutliff: inProcessing and Fabrication of Advanced Materials for High Temperature Applications III, V.A. Ravi, T.S. Srivatsan, and J.J. Moore, eds. TMS Warrendale, PA, 1993, pp. 547–65.Google Scholar
  11. 11.
    M.R. Jackson, R.G. Rowe, and D.W. Skelly: GE-CRD. WRDC Contract No. F33615-91-C-5613, Annual Report, 1994.Google Scholar
  12. 12.
    M.R. Jackson and K.D. Jones: inRefractory Metals Extraction, Processing and Applications, K.C. Liddell, D.R. Sadoway, and R.G. Bautista, eds., TMS, Warrendale, PA, 1991, pp. 310–20.Google Scholar
  13. 13.
    K.-M. Chang, B.P. Bewlay, J.A. Sutliff, and M.R. Jackson:J. Met., 1992, vol. 44 (6), p. 59.Google Scholar
  14. 14.
    Standard Test Method for Plane-Strain Fracture Toughness of Metallic Materials, ASTM STP E-399, ASTM, Philadelphia, PA, 1983, July, pp. 488–512.Google Scholar
  15. 15.
    Standard Practice for R-Curve Determination, ASTM STP E 561-94, ASTM, Philadelphia, PA, 1994.Google Scholar
  16. 16.
    B.P. Bewlay, M.R. Jackson, W.J. Reeder, and H.A. Lipsitt.High Temperature Ordered Intermetallic Alloys VI, Materials Research Society Symposia Proceedings, Materials Research Society, Pittsburgh, PA, 1994, vol. 364, pp. 943–48.Google Scholar
  17. 17.
    P.R. Subramanian, M.G. Mendiratta, G.A. Henshall, and M.J. Strum:High Temperature Ordered Intermetallic Alloys VI, Materials Research Society Symposia Proceedings, Materials Research Society, Pittsburgh, PA, 1994, vol. 364, pp. 937–42.Google Scholar
  18. 18.
    P.R. Subramanian, T.A. Parthasarathy, M.G. Mendiratta, and D.M. Dimiduk:Scripta Metall., 1995, vol. 32 (8), pp. 1227–32.CrossRefGoogle Scholar

Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 1996

Authors and Affiliations

  • B. P. Bewlay
    • 1
  • M. R. Jackson
    • 1
  • H. A. Lipsitt
    • 2
  1. 1.the Corporate Research and Development CenterGeneral Electric CompanySchenectady
  2. 2.the Department of Mechanical and Materials EngineeringWright State UniversityDayton

Personalised recommendations