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Journal of Materials Science

, Volume 29, Issue 18, pp 4764–4770 | Cite as

TEM and high-temperature X-ray diffractometric studies on the structural transformations in Ni3Al

  • R. Ramesh
  • B. Pathiraj
  • B. H. Kolster
Papers

Abstract

High-temperature X-ray diffraction and TEM studies were conducted on nickel-rich boron-doped Ni3Al in order to confirm our earlier observations on the existence of a structural transformation in these alloys. The results obtained are discussed through a model proposed. The L12 structure appears to transform to another L12 or to a DO22 structure during heating. Such a transformation starts at around 700 °C and seems to complete around 1100 °C and appears to be of a continuous type. In the temperature range 700–1100 °C both phases coexist, which causes a tetragonal distortion of the L12 lattice giving rise to a tweed morphology in TEM observations. The transformation mechanism involves a periodic modulation of lattice constant. The calculated values for this periodicity (expressed as a number of unit cells in the [100] direction) obtained from X-ray diffraction (L = 62, 70, 74) matched well with that (L = 65) obtained using TEM.

Keywords

Polymer Lattice Constant Early Observation Ni3Al Periodic Modulation 
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.
    M. Hansen, “Constitution of Binary Alloys” (McGraw-Hill, New York, 1958) p. 119.Google Scholar
  2. 2.
    R. Ramesh, R. Vasudevan, B. Pathiraj and B. H. Kolster, J. Mater. Sci. 27 (1992) 270.CrossRefGoogle Scholar
  3. 3.
    R. Ramesh, B. Pathiraj, J. H. Maas and B. H. Kolster, Mater. Sci. Engng A12 (1992) 60.CrossRefGoogle Scholar
  4. 4.
    L. E. Tanner, Phil Mag. 14 (1966) 111.CrossRefGoogle Scholar
  5. 5.
    L. E. Tanner and H. J. Leamy, in Proceedings of International Symposium on Order-Disorder Transformations in Alloys, Tubingen, Germany, 1973, p. 183.Google Scholar
  6. 6.
    P. J. Fillingham, H. J. Leamy and L. E. Tanner, “Electron Microscopy and Structure of Materials” (University of California Press, Berkeley, 1972) p. 163.Google Scholar
  7. 7.
    A. H. Heuer and M. Ruhle, in Proceedings of 2nd International Conference on Science and Technology of Zirconia, Stuttgart, Germany, 1983, Vol. 12, p. 1.Google Scholar
  8. 8.
    J. Cheng, C. S. Lee, C. N. J. Wagner and A. J. Ardell, Mrs Proc. 113 (1989) 499.Google Scholar
  9. 9.
    K. M. Chang, S. C. Huang and A. I. Taub, ibid. 28 (1987) 401.Google Scholar
  10. 10.
    E. L. Raymond, Trans. AIME. 239 (1967) 1415.Google Scholar
  11. 11.
    R. F. Decker, in Proceedings of Symposium on Steel Strengthening Mechanisms, Zurich, Switzerland, 1969, p. 1.Google Scholar
  12. 12.
    V. Daniel and H. Lipson, Proc. Roy. Soc. A 181 (1943) 368.CrossRefGoogle Scholar
  13. 13.
    S. C. Moss and P. C. Clapp, Phys. Rev. 171 (1968) 764.CrossRefGoogle Scholar
  14. 14.
    T. Suzuki, Y. Oya and D. M. Wee, Acta. Metall. 28 (1980) 301.CrossRefGoogle Scholar
  15. 15.
    O. Noguchi, Y. Oya and T. Suzuki, Met. Trans. 12A (1981) 1647.CrossRefGoogle Scholar

Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • R. Ramesh
    • 1
  • B. Pathiraj
    • 1
    • 2
  • B. H. Kolster
    • 1
    • 2
  1. 1.Foundation for Advanced Metals Science (SGM)KA HengeloThe Netherlands
  2. 2.Faculty of Mechanical EngineeringUniversity of TwenteEnschedeThe Netherlands

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