Advertisement

Metallurgical Transactions A

, Volume 21, Issue 2, pp 627–639 | Cite as

Deformation structure in a Ti-24Al-11Nb alloy

  • D. Banerjee
  • A. K. Gogia
  • T. K. Nandy
Mechanical Behavior

Abstract

A Ti-24Al-11Nb alloy has been heat-treated so as to obtain a microstructure of coarse α2 particles (D019 structure based on Ti3Al) in a matrix of the ordered βo phase (B2 structure based on Ti2AlNb). Dislocation structures generated by tensile strains of ∼2 pct at room temperature have been analyzed by transmission electron microscopy The βo phase is shown to deform inhomogeneously on {110}, {112}, and {123} planes by α/〈211〉 slip. The slipband structure is complex, consisting of segments of heavily pinned edge dislocations with periodic cross slip of screw components on to secondary slip planes. Incompatibility stresses at α2o interfaces can generate fine α[100] slip as well. The α2 phase deforms independently by α dislocation slip. Slipbands in the βo phase can shear the α2 phase by activatingc +a/2 slip on\(\left\{ {2\overline 2 01} \right\}\) and\(\left\{ {22\overline 4 2} \right\}\) slip planes, as well asa slip on higher order pyramidal planes, where the parallelism of the specific slip system is permitted by the Burgers relationship between the two phases.

Keywords

Metallurgical Transaction Slip System Burger Vector Slip Plane Screw Dislocation 
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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    M.J. Blackburn and M.P. Smith: Air Force Technical Report, AFWAL-TR-81-4046, 1981.Google Scholar
  2. 2.
    A.K. Gogia, D. Banerjee, and T.K. Nandy:Metall. Trans. A, 1990, vol. 21A, pp. 609–25.Google Scholar
  3. 3.
    A.K. Gogia, T.K. Nandy, D. Banerjee, and Y. Mahajan: 6th World Conf. on Titanium, 1988, P. Lacombe, R. Tricot, and G.Béranger, eds.,J. Phys. (Le Ulis, Fr.), pp. 1097-1102.Google Scholar
  4. 4.
    S.M.L. Sastry and H.A. Lipsitt:Ti 80, Science and Technology, H. Kimura and O. Izumi, eds., TMS-AIME, Warrendale, PA, 1980, pp. 1231–43.Google Scholar
  5. 5.
    S.A. Court, M.H. Loretto, and H.L. Fraser:Scripta Metall., 1987, vol. 21, pp. 997–1002.CrossRefGoogle Scholar
  6. 6.
    M. Thomas, A. Vassel, and P. Veyssiere:Scripta Metall., 1987, vol. 21, pp. 501–06.CrossRefGoogle Scholar
  7. 7.
    S.A. Court, J.P.A. Lofvander, M.H. Loretto, and H.L. Fraser:Phil. Mag. A, 1989, vol. 59A, pp. 379–99.CrossRefGoogle Scholar
  8. 8.
    R.A. Spurling:Metall. Trans. A, 1975, vol. 6A, pp. 1660–61.Google Scholar
  9. 9.
    D. Banerjee and J.L. Strudel: Defence Metallurgical Research Laboratory, Hyderabad, India, unpublished research, 1989.Google Scholar
  10. 10.
    .B. Hirsch, A. Howie, R.B. Nicholson, D.W. Pashley, and M.J. Whelan:Electron Microscopy of Thin Crystals, Butterworth’s, London, 1965, pp. 311–16.Google Scholar
  11. 11.
    W.G. Burgers:Physica, 1934, vol. 1, p. 561.CrossRefGoogle Scholar
  12. 12.
    R. Strychor, J.C. Williams, and W.A. Soffa:Metall. Trans. A, 1988, vol. 19A, pp. 225–34.Google Scholar
  13. 13.
    K. Otsuka, C.M. Wayraan, and H. Kubo:Metall. Trans. A, 1978, vol. 9A, pp. 1075–85.Google Scholar
  14. 14.
    D. de Fontaine:Metall. Trans. A, 1988, vol. 19A, pp. 169–75.Google Scholar
  15. 15.
    R. Romero, F. Lovey, and M. Ahlers:Phil. Mag. A, 1988, vol. 58, pp. 881–903.CrossRefGoogle Scholar
  16. 16.
    J.C. Ingram, P.P. Strutt, and W. Tzeug:Phys. Status Solidi, 1974, vol. 22, pp. 599–608.CrossRefGoogle Scholar
  17. 17.
    P.B. Price:Electron Microscopy and the Strength of Crystals, G. Thomas and J. Washburn, eds., Interscience, New York, NY, 1963, pp. 41–130.Google Scholar
  18. 18.
    W.A. Rachinger and A.H. Cottrell:Acta Metall., 1956, vol. 4, pp. 109–13.CrossRefGoogle Scholar
  19. 19.
    A. Ball and R.E. Smallman:Acta Metall., 1966, vol. 14, pp. 1517–26.CrossRefGoogle Scholar
  20. 20.
    D.I. Potter:Mater. Sci. Eng., 1969-70, vol. 5, pp. 201–09.Google Scholar
  21. 21.
    E.P. Lautenschlager, T. Hughes, and J.O. Brittain:Acta Metall., 1967, vol. 15, pp. 1347–57.CrossRefGoogle Scholar
  22. 22.
    M.G. Mendiratta and C.C. Law:J. Mater. Sci., 1987, vol. 22, pp. 607–11.CrossRefGoogle Scholar
  23. 23.
    M. Yamaguchi and Y. Umakoshi:Phil. Mag. A, 1979, vol. 39, pp. 33–40.CrossRefGoogle Scholar
  24. 24.
    S. Takeuchi:Phil. Mag. A, 1980, vol. 41, pp. 541–53.CrossRefGoogle Scholar
  25. 25.
    M. Yamaguchi:Mechanical Properties of bcc Metals, M. Meshii, ed.,TMS-AIME, Warrendale, PA, 1982, pp. 31–40.Google Scholar
  26. 26.
    M. Yamaguchi and Y. Umakoshi:Acta Metall., 1976, vol. 24, pp. 1061–67.CrossRefGoogle Scholar
  27. 27.
    Y. Umakoshi and M. Yamaguchi:Phil. Mag. A, 1980, vol. 41, pp. 573–88.CrossRefGoogle Scholar
  28. 28.
    P.A. Flinn:Trans. TMS-AIME, 1960, vol. 218, p. 145.Google Scholar
  29. 29.
    M.H. Loretto and R.J. Wasilewski:Phil. Mag., 1971, vol. 23, pp. 1311–28.CrossRefGoogle Scholar
  30. 30.
    J.R. Low and A.M. Turkalo:Acta Metall., 1962, vol. 10, pp. 215–27.CrossRefGoogle Scholar
  31. 31.
    M.G. Mendiratta, H.-M. Kim, and H.A. Lipsitt:Metall. Trans. A, 1984, vol. 15A, pp. 395–99.Google Scholar
  32. 32.
    D.A. Koss and J.C. Chesnutt:Titanium Science and Technology, R.I. Jaffee and H.M. Burte, eds., Plenum Press, New York, NY, 1973, vol. 2, pp. 1097–1107.Google Scholar
  33. 33.
    N.E. Paton and J.C. Williams:2nd Int. Conf. on the Strength of Metals and Alloys, ASM, Metals Park, OH, 1970, pp. 108–12.Google Scholar
  34. 34.
    J.C. Williams and G. Luetjering:Ti 80, Science and Technology, H. Kimura and O. Izumi, eds., TMS-AIME, Warrendale, PA, 1980, vol. 1, pp. 671–81.Google Scholar
  35. 35.
    A. Gysler, G. Liitjering, and V. Gerold:Acta Metall., 1974, vol. 22, pp. 901–09.CrossRefGoogle Scholar
  36. 36.
    N.E. Paton, J.C. Williams, and G.P. Rauscher:Titanium Science and Technology, R.I. Jaffee and H.M. Burte, eds., Plenum Press, New York, NY, 1973, vol. 2, pp. 1049–69.Google Scholar
  37. 37.
    M.J. Blackburn and J.C. Williams:Trans. ASM, 1969, vol. 62, pp. 398–409.Google Scholar
  38. 38.
    D. Banaerjee, T.K. Nandy, and A.K. Gogia:Scripta Metall., 1987, vol. 21, pp. 597–600.CrossRefGoogle Scholar

Copyright information

© The Metallurgical of Society of AIME 1990

Authors and Affiliations

  • D. Banerjee
    • 1
  • A. K. Gogia
    • 1
  • T. K. Nandy
    • 1
  1. 1.Defence Metallurgical Research LaboratoryHyderabadIndia

Personalised recommendations