Advertisement

Journal of Phase Equilibria

, 19:577 | Cite as

The Nb-Ti-Si ternary phase diagram: Determination of solid-state phase equilibria in Nb- and Ti-rich alloys

  • B. P. Bewlay
  • M. R. Jackson
  • R. R. Bishop
Section I: Basic and Applied Research

Abstract

Ternary Nb-Ti-Si phase equilibria have been investigated for the metal-rich end of the ternary phase diagram using scanning electron microscopy, XRD, and electron beam microprobe analysis. Microstructural and microchemical observations have been used to define isothermal sections at temperatures of 1500 and 1340 °C. These temperatures delineate regimes defined by liquid-solid reactions. Additional isothermal sections were estimated at 1350,1320, and 1150 °C using these data. A broad range of Nb and Ti compositions were investigated for Si concentrations up to 35.0 %. Alloys containing up to four phases, Nb(Ti)5Si3, Ti(Nb)5Si3, (Nb,Ti)3Si, and (Nb,Ti,Si) were studied. The effect of Ti on the eutectoid reaction, (Nb,Ti)3Si → (Nb,Ti,Si) + Nb(Ti)5Si3 was investigated, as was the effect of Nb on the peritectoid reaction, Ti(Nb)5Si3 + (Nb,Ti,Si) → (Nb,Ti)3Si.

Keywords

Isothermal Section Phase Field Ternary Phase Diagram Large Volume Fraction Directionally Solidify 
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.

Cited References

  1. 1.
    P.R. Subramanian, M.G. Mendiratta, and D.M. Dimiduk,Mater. Res. Soc. Symp. Prvc, 322, 491–502 (1994).Google Scholar
  2. 2.
    B.P. Bewlay, M.R. Jackson, W.J. Reeder, and H.A. Lipsitt,Mater. Res. Soc. Symp. Proc., 364, 943–948 (1995).Google Scholar
  3. 3.
    M.R. Jackson, B.P. Bewlay, R.G. Rowe, D.W. Skelly, and H.A. Lipsitt,J. Met., 48(1), 33–39 (1996).Google Scholar
  4. 4.
    B.P. Bewlay, M.R. Jackson, and H.A. Lipsitt,J. Phase Equilibria, 18(3), 264–278 (1997).CrossRefGoogle Scholar
  5. 5.
    T.B. Massalski, RR. Subramanian, H. Okamoto, and L. Kacprzak, Ed.,Binary Alloy Phase Diagrams, 2nd ed., Vol. 3, ASM International, Materials Park, OH, 3371 (1991).Google Scholar
  6. 6.
    F.N. Rhines,Phase Diagrams in Metallurgy-Their Development and Application, McGraw-Hill, London (1956).Google Scholar
  7. 7.
    H. Liang and Y.A. Chang, private communication (Oct 1997).Google Scholar
  8. 8.
    R. Grylls and H. Fraser, Ohio State University (Sept 1997).Google Scholar

Copyright information

© ASM International 1998

Authors and Affiliations

  • B. P. Bewlay
    • 1
  • M. R. Jackson
    • 1
  • R. R. Bishop
    • 2
  1. 1.General Electric CompanyCorporate Research and DevelopmentSchenectady
  2. 2.Department of Materials EngineeringNorthwestern UniversityEvanston

Personalised recommendations