Journal of Materials Science

, Volume 22, Issue 1, pp 27–36 | Cite as

On the nucleation ofθ′ and T1 on Al3Zr precipitates in Al-Li-Cu-Zr alloys

  • J. M. Galbraith
  • M. H. Tosten
  • P. R. Howell
Papers

Abstract

Two quaternary Al-Li-Cu-Zr alloys have been investigated using electron microscopy. Ageing at 190° C resulted in the nucleation ofθ′ precipitates on the Al3Zr/matrix interface in addition to heterogeneous nucleation on matrix dislocations. In the majority of cases, the broad, coherent face of theθ′ plans ms in contact with the Al3Zr precipitates. Similar evidence showed that nucleation of T1 precipitates occurred on the Al3Zr, but to a lesser extent thanθ′. Solid-solid nucleation theory has been used to account for the Al3Zr acting as a nucleation substrate.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    T. H. Sanders Jr andE. A. Starke Jr, (eds) in “Aluminum-Lithium Alloys” (TMS-AIMS, Warrendale, PA. 1981).Google Scholar
  2. 2.
    T. H. Sanders Jr andE. A. Starke Jr (eds) in “Aluminum-Lithium Alloys II” (TMS-ATME, Warrendale, PA, 1984).Google Scholar
  3. 3.
    A. K. Vasudevan, R. C. Malcom, W. G. Fricke andR. J. Rioja, “Resistance to Fracture, Fatigue and Stress of Al-Cu-Li-Zr Alloys”, Final Report, NAVAIR Contract No. N00019-80-C-0569, (1985).Google Scholar
  4. 4.
    E. Ness andN. Ryum,Scripta. Metall. 5 (1971) 987.Google Scholar
  5. 5.
    E. Ness,Acta Metall. 20 (1972) 499.Google Scholar
  6. 6.
    W. Stimson, M. H. Tosten, P. R. Howell andD. B. Williams, in Proceedings of the 3rd International Al-Li Conference, Oxford (The Institute of Metals, London, 1980.Google Scholar
  7. 7.
    P. L. Makin andB. Ralph,J. Mater. Sci. 19 (1984) 3835.Google Scholar
  8. 8.
    P. J. Gregson andH. M. Flower,J. Mater. Sci. Lett. 3 (1984) 829.Google Scholar
  9. 9.
    M. H. Tosten, A. K. VasudevanandP. R. Howell, in Proceedings of the 3rd International Al-Li Conference, Oxford (The Institute of Metals, London, 1986) p. 490.Google Scholar
  10. 10.
    R. F. Hehemann, in “Phase Transformations” (ASM, Metals Park, Ohio, 1970) p. 397.Google Scholar
  11. 11.
    C. W. Spencer andD. J. Mack, in “Decomposition of Austenite by Diffusional Processes” (Interscience, New York, 1962) p. 549.Google Scholar
  12. 12.
    R. B. Nicholson, in “Phase Transformations” (ASM, Metals Park, Ohio, 1970) p. 269.Google Scholar
  13. 13.
    J. W. Gibbs, in “On the Equilibrium of Heterogeneous Substances, Collected Works” (Longsmans, New York, 1928).Google Scholar
  14. 14.
    W. C. Johnson, C. L. White, P. E. Marth, P. K. Ruf, S. M. Tuominen, K. D. Wade, K. C. Russell andH. I. Aaronson,Metall. Trans. A 6A (1975) 911.Google Scholar
  15. 15.
    P. E. Marth, H. I. Aaronson, G. W. Lorimer, T. L. Bartel andK. C. Russell,Metall. Trans. A 7A 1976) 153.Google Scholar
  16. 16.
    J. M. Simerska andV. Synecek,Acta. Metall. 15 (1967) 223.Google Scholar
  17. 17.
    M. H. Jacobs andD. W. Pashley, in “The Mechanism of Phase Transformations in Crystalline Solids” (Institute of Metals, London, 1969) p. 43.Google Scholar
  18. 18.
    G. W. Lorimer,Fizika 2 (1970) 331.Google Scholar
  19. 19.
    G. W. Lorimer andR. B. Nicholson, in “The Mechanism of Phase Transformations in Crystalline Solids” (Institute of Metals, London, 1969) p. 36.Google Scholar
  20. 20.
    G. W. Lorimer andR. B. Nicholson,Acta. Metall. 14 (1966) 1009.Google Scholar
  21. 21.
    P. N. T. Unwin, G. W. Lorimer andR. B. Nicholson,ibid. 17 (1969) 136.Google Scholar
  22. 22.
    H. A. Holl,Metal Sci. J. 1 (1967) 111.Google Scholar
  23. 23.
    D. W. Pashley, J. Rhodes andA. Dendorek,J. Inst. Met. 94 (1966) 41.Google Scholar
  24. 24.
    D. W. Pashley, M. H. Jacobs andJ. T. Vietz,Phil. Mag. 16 (1967) 51.Google Scholar
  25. 25.
    J. P. Simon andP. Guyot,J. Mater. Sci. 12 (1978) 202.Google Scholar
  26. 26.
    D. Vaughan,Acta. Metall. 16 (1968) 563.Google Scholar
  27. 27.
    B. Forest andM. Biscondi,J. Mater. Sci. 12 (1978) 202.Google Scholar
  28. 28.
    H. I. Aaronson, J. B. Clark andC. Laird,Met. Sci. J. 2 (1968) 155.Google Scholar
  29. 29.
    R. D. Doherty,Met. Sci. 16 (1982) 1.Google Scholar
  30. 30.
    S. F. Baumann andD. B. Williams,Scripta. Metall. 18 (1984) 611.Google Scholar

Copyright information

© Chapman and Hall Ltd. 1987

Authors and Affiliations

  • J. M. Galbraith
    • 1
  • M. H. Tosten
    • 1
  • P. R. Howell
    • 1
  1. 1.Department of Materials Science and EngineeringThe Pennsylvania State UniversityUniversity ParkUSA

Personalised recommendations