Skip to main content
SpringerLink
Log in

Microstructure study on the effect of titanium in the aging treatment of an Al-Zn-Mg alloy

  • Published:
Metallurgical Transactions A Aims and scope Submit manuscript

Abstract

A study has been made of the effect of Ti additions on the microstructure in two stage and single stage aging of an Al-5 Zn-2 Mg alloy. The influence of aging treatment was examined for alloys with and without Ti addition. The alloys were solution heat treated at 510°C, air cooled then aged at various temperatures below the GP zone solvus for short times before aging above the GP zone solvus at 200°C. The Ti addition alloy yields a small precipitate free zone (PFZ ∼ 0.3 μ) and a higher density of precipitate near the edge of the PFZ than in the midgrain region. The ternary alloy without Ti addition produces a wide range of PFZ sizes (0.4 to 4 μ) depending upon the aging temperature below the GP zone solvus. Significant changes in the morphology of the matrix precipitate, the amount of grain boundary precipitate, and the width of the PFZ, were observed in single stage aging at 200°C as a result of the Ti addition. These results could be explained in terms of Ti interacting with vacancies or solute atoms, causing the changes in the vacancy and/or solute concentration profiles. A model based upon solute and vacancy concentrations coupled with a time at temperature effect has been developed to allow the interpretation of the observed two-stage aging results in an Al-Zn-Mg alloy.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. G. Thomas and J. Nutting:J. Inst. Metals, 1959-60, vol. 88, p. 81.

    Google Scholar 

  2. J. L. Taylor:J. Inst. Metals, 1963-64, vol. 92, p. 301.

    Google Scholar 

  3. J. D. Ebury and R. B. Nicholson:Acta Met., 1965, vol. 13, p. 403.

    Article  Google Scholar 

  4. P. N. T. Unwin, G. W. Lorimer, and R. B. Nicholson:Acta Met, 1969, vol. 17, p. 1363.

    Article  CAS  Google Scholar 

  5. D. W. Pashley, M. H. Jacobs, and J. T. Vietz:Phil. Mag., 1967, vol. 16, p. 51.

    CAS  Google Scholar 

  6. G. W. Lorimer and R. B. Nicholson:Acta Met., 1966, vol. 14, p. 1009.

    Article  CAS  Google Scholar 

  7. C. A. Gove and G. Judd:Met. Trans., 1973, vol. 4, p. 1023.

    Google Scholar 

  8. J. J. Polmear:J. Inst. Metals, 1958-59, vol. 87, p. 24.

    CAS  Google Scholar 

  9. C. R. Shastry and G. Judd:Met.Trans., 1971, vol. 2, p. 3283.

    CAS  Google Scholar 

  10. M. H. Jacobs and D. W. Pashley:The Mechanism of Phase Transformations in Crystalline Solids, pp. 43–48, The Institute of Metals, London, 1969.

    Google Scholar 

  11. W. F. Smith and N. J. Grant:Trans. ASM, 1969, vol. 62, p. 724.

    CAS  Google Scholar 

  12. M. Doyama:Phys. Lett., 1966, vol. 21, no. 4, p. 395.

    Article  CAS  Google Scholar 

  13. P. Doig and J. W. Edington:Met. Trans. A, 1975, vol. 6A, no. 4, p. 943.

    Google Scholar 

Download references

Author information

Author notes

  1. C. Chen (Postdoctoral Assistant)

    Present address: Carnegie-Mellon Institute, 15213, Pittsburgh, PA

Authors and Affiliations

  1. Rensselaer Polytechnic Insitute, 12181, Troy, NY

    G. Judd (Professor of Materials Engineering and Vice Provost)

Authors
  1. C. Chen
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. G. Judd
    View author publications

    You can also search for this author in PubMed Google Scholar

Additional information

Formerly Graduate Research Assistant, Materials Engineering, Rensselaer Polytechnic Institute, Troy, New York.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Chen, C., Judd, G. Microstructure study on the effect of titanium in the aging treatment of an Al-Zn-Mg alloy. Metall Trans A 9, 553–559 (1978). https://doi.org/10.1007/BF02646412

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF02646412

Keywords

Search

Navigation