Advertisement

Metallurgical Transactions A

, Volume 11, Issue 6, pp 993–999 | Cite as

Microanalysis of precipitate free zones (PFZ) in Al-Zn-Mg and Cu-Ni-Nb alloys

  • M. Raghavan
Transformations

Abstract

In order to better understand the formation of Precipitate Free Zones (PFZ), microanalysis was conducted on heat treated Al-2.2 at. pct Zn-4.7 at. pct Mg and Cu-30 at. pct Ni-0.9 at. pct Nb alloys. In both the alloys, no appreciable solute depletion at the grain boundaries was observed in the as-quenched condition. After aging, marked solute depletion was observed in the PFZ of both the alloys. In the Al-Zn-Mg alloy, the PFZ were supersaturated with respect toη andT phases up to 4 h of aging at 473 K. In the Cu-Ni-Nb alloy, the PFZ were supersaturated only with respect to theβ phase but not the metastable γ″ phase. Based on the results, the factors affecting the formation and growth of PFZ are discussed.

Keywords

Metallurgical Transaction Stress Corrosion Crack Precipitate Free Zone Solute Profile Stress Corrosion Crack Susceptibility 
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.
    H. S. Rosenbaum and D. Turnbull:Acta Met., 1958, vol. 6, p. 653.CrossRefGoogle Scholar
  2. 2.
    H. S. Rosenbaum, D. Turnbull, and E. I. Alessandrini:Acta Met., 1959, vol. 7, p. 678.CrossRefGoogle Scholar
  3. 3.
    J. B. Clark:Acta Met., 1964, vol. 12, p. 1197.CrossRefGoogle Scholar
  4. 4.
    J. C. Taylor:J. Inst. Met., 1963–64, vol. 93, p. 301.Google Scholar
  5. 5.
    G. Thomas and J. Nutting:J. Inst. Met., 1959–60, vol. 88, p. 81.Google Scholar
  6. 6.
    P. N. T. Unwin, G. W. Lorimer, and R. B. Nicholson:Acta Met., 1969, vol. 17, p. 1363.CrossRefGoogle Scholar
  7. 7.
    P. N. T. Unwin and R. B. Nicholson:Acta Met., 1969, vol. 17, p. 1379.CrossRefGoogle Scholar
  8. 8.
    J. D. Embury and R. B. Nicholson:Acta Met., 1965, vol. 13, p. 403.CrossRefGoogle Scholar
  9. 9.
    J. D. Embury and R. B. Nicholson:J. Aust. Inst. Met., 1963, vol. 8, p. 76.Google Scholar
  10. 10.
    G. W. Lorimer and R. B. Nicholson:Acta Met., 1966, vol. 14, p. 1009.CrossRefGoogle Scholar
  11. 11.
    M. Raghavan:Met. Trans. A, 1977, vol. 8A,p. 1071.Google Scholar
  12. 12.
    G. Thomas:J. Inst. Met., 1960–61, vol. 89, p. 287.Google Scholar
  13. 13.
    C. S. Pande, M. Suenega, B. Vyas, H. S. Isaacs, and D. F. Harling:Scripta Met., 1977, vol. 11, p. 681.CrossRefGoogle Scholar
  14. 14.
    D. E. Ward and G. M. Lorimer:Proc. of 3rd International Conf. on Strength of Metals and Alloys, Institute of Metals, 1973, vol. 1, p. 488.Google Scholar
  15. 15.
    P. R. Sperry:Met. Trans., 1970, vol. 1, p. 2650.Google Scholar
  16. 16.
    P. Doig, J. W. Edington, and G. Hibberf.Phil. Mag., 1973, vol. 38, p. 971.Google Scholar
  17. 17.
    P. Doig and J. W. Edington:Met. Trans. A, 1975, vol. 6A, p. 943.Google Scholar
  18. 18.
    P. Doig and J. W. Edington:Corrosion, 1975, vol. 31, p. 347.Google Scholar
  19. 19.
    C. R. Shastry and G. Judd:Met. Trans., 1972, vol. 3, p. 779.CrossRefGoogle Scholar
  20. 20.
    S. L. Cundy, A. J. F. Metherell, and M. J. Whelan:Proc. Roy. Soc., 1968, vol. 307, A, p. 267.CrossRefGoogle Scholar
  21. 21.
    D. B. Williams and J. W. Edington:J. Microscopy, 1976, vol. 108, p. 113.Google Scholar
  22. 22.
    E. A. Starke, Jr.:J. Metals, January 1970, vol. 22, p. 54.Google Scholar
  23. 23.
    C. Chen and G. Judd:Met. Trans. A, 1978, vol. 9A, p. 553.CrossRefGoogle Scholar
  24. 24.
    J. I. Goldstein, J. L. Costley, G. W. Lorimer, and S. J. B. Reed:Scanning Electron Microscopy, O. Johari, ed., vol. 1, p. 315, HT Research Institute, Chicago, IL, 1977.Google Scholar
  25. 25.
    J. I. Goldstein:Introduction to Analytical Electron Microscopy, J. J. Hren, J. I. Goldstein, and D. C. Joy, eds., p. 83, Plenum Press, New York, 1979.Google Scholar
  26. 26.
    G. Cliff and G. W. Lorimer:J. Microscopy, 1975, vol. 103, p. 203.Google Scholar
  27. 27.
    J. Russ:Quantitative Electron Probe Microanalysis of Particles, Proc. 8th National Conference on Electron Probe Analysis, p. 30, National Bureau of Standards, Washington, 1973.Google Scholar
  28. 28.
    V. A. Phillips:Acta Met., 1966, vol. 14, p. 1533.CrossRefGoogle Scholar
  29. 29.
    V. A. Phillips:Trans. TMS-AIME, 1966, vol. 236, p. 1302.Google Scholar
  30. 30.
    V. A. Phillips:Phil. Mag., 1967, vol. 16, p. 139.Google Scholar
  31. 31.
    M. Raghavan: Exxon Research and Engineering Company, Linden, NJ, unpublished work, 1979.Google Scholar

Copyright information

© American Society for Metals and The Metallurgical Society of AIME 1980

Authors and Affiliations

  • M. Raghavan
    • 1
  1. 1.Corporate Research Science LaboratoriesExxon Research and Engineering CompanyLinden

Personalised recommendations