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Journal of Materials Science

, Volume 21, Issue 11, pp 4003–4008 | Cite as

Superplastic deformation characteristics of two microduplex titanium alloys

  • M. T. Cope
  • D. R. Evetts
  • N. Ridley
Papers

Abstract

A comparison of the superplastic deformation behaviour of Ti-6Al-4V (wt%) between 760 and 940‡ C and Ti-6Al-2Sn-4Zr-2Mo between 820 and 970‡ C has been carried out on sheet materials possessing similar as-received microstructures. High tensile elongations were obtained with maximum values being recorded at 880‡ C for Ti-6Al-4V (Ti-6/4) and at 940‡ C for Ti-6Al-2Sn-4Zr-2Mo (Ti-6/2/4/2), under which conditions both alloys possessed aΒ phase proportion of approximately 0.40. For a given deformation temperature the Ti-6/4 alloy had a slightly lower flow stress than the Ti-6/2/4/2, and this was attributed to the lowerΒ phase proportion in the latter alloy. However, at the respective optimum deformation temperatures the Ti-6/2/4/2 alloy had the lower flow stress. The results show that suitably processed Ti-6/2/4/2 alloy is capable of withstanding substantial superplastic strains at relatively low flow stresses, although the optimum deformation temperature is higher for this alloy than for Ti-6/4 material possessing a similar microstructure.

Keywords

Titanium Titanium Alloy Flow Stress Deformation Behaviour Deformation Temperature 
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.

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References

  1. 1.
    N. E. Paton andC. H. Hamilton Met. Trans. A 10A (1979) 241.Google Scholar
  2. 2.
    A. K. Ghosh andC. H. Hamilton ibid. 10A (1979) 699.Google Scholar
  3. 3.
    A. Arieli andA. K. Mukherjee,Mat. Sci. Eng. 43 (1980) 47.Google Scholar
  4. 4.
    O. A. Kaibyshev, I. V. Kazachkov andR. M. Galeev,J. Mater. Sci. 16 (1981) 2501.Google Scholar
  5. 5.
    N. Furushiro, H. Ishibashi, S. Shimoyama andS. Hori, in Proceedings of 4th International Conference on Titanium Science and Technology, Kyoto, May 1980, edited by H. Kimura and O. Izumi (Metallurgical Society of AIME, Warrendale, Pennsylvania, 1980) p. 993.Google Scholar
  6. 6.
    E. D. Weisert andG. W. Stacher, in Proceedings of International Conference on Superplastic Forming of Structural Alloys, San Diego, June 1982 edited by N. E. Paton and C. H. Hamilton (Metallurgical Society of AIME, Warrendale, Pennsylvania, 1982) p. 273.Google Scholar
  7. 7.
    J. R. Williamson,ibid.in, p. 241.Google Scholar
  8. 8.
    B. W. Kim,ibid.in, p. 291.Google Scholar
  9. 9.
    D. Eylon, S. Fujishiro, P. J. Postans andF. H. Froes,J. Metals 36(11) (1984) 55.Google Scholar
  10. 10.
    S. M. L. Sastry, R. J. Lederich, T. L. Mackay andW. R. Kerr,ibid. 35(1) (1983) 48.Google Scholar
  11. 11.
    M. T. Cope, MSc thesis, University of Manchester (1982).Google Scholar
  12. 12.
    I. Polmear, “Metallurgy of the Light Metals” (Edward Arnold, London, 1982) p. 165.Google Scholar
  13. 13.
    J. W. D. Patterson andN. R. Ridley,J. Mater. Sci. 16 (1981) 457.Google Scholar
  14. 14.
    J. R. Leader, C. Hammond andD. F. Neal, in Proceedings of International Conference on Superplastic Forming of Structural Alloys, San Diego, June 1982, edited by N. E. Paton and C. H. Hamilton (Metallurgical Society of AIME, Warrendale, Pennsylvania, 1982) p. 355.Google Scholar
  15. 15.
    J. A. Wert andN. E. Paton, in Proceedings of 6th International Conference on Strength of Metals and Alloys, Melbourne, 1982, edited by R. C. Gifkins (Pergamon Press, Oxford, 1982) p. 727.Google Scholar
  16. 16.
    Idem, Met. Trans. A 14A (1983) 2535.Google Scholar
  17. 17.
    N. E. Paton andJ. A. Hall, US Patent 4 299 626 (1981).Google Scholar
  18. 18.
    C. Hammond andJ. Nutting Metal Sci. 11 (1977) 474.Google Scholar
  19. 19.
    C. H. Hamilton, A. K. Ghosh andM. W. Mahoney, in Proceedings of Conference on Advanced Processing Methods for Titanium, edited by D. F. Hasson and C. H. Hamilton (Metallurgical Society of AIME, Warrendale, Pennsylvania, 1982) p. 124.Google Scholar
  20. 20.
    J. W. Edington, K. N. Melton andC. P. Cutler,Prog. Mater. Sci. 21(3) (1976) 61.Google Scholar
  21. 21.
    M. T. Cope, unpublished research (1983).Google Scholar
  22. 22.
    M. J. Stowell, in Proceedings of International Conference on Superplastic Forming of Structural Alloys, San Diego, June 1982, edited by N. E. Paton and C. H. Hamilton (Metallurgical Society of AIME, Warrendale, Pennsylvania, 1982) p. 321.Google Scholar

Copyright information

© Chapman and Hall Ltd. 1986

Authors and Affiliations

  • M. T. Cope
    • 1
  • D. R. Evetts
    • 2
  • N. Ridley
    • 1
  1. 1.Department of Metallurgy and Materials ScienceUniversity of Manchester/UMISTManchesterUK
  2. 2.Metallurgical Research LaboratoriesDerbyUK

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