Skip to main content
SpringerLink
Log in

Superplasticity in a high strength powder aluminum Alloy with and without SiC Reinforcement

  • Mechanical Behavior
  • Published:
Metallurgical Transactions A Aims and scope Submit manuscript

Abstract

The superplastic properties of a rapidly solidified, high strength P/M Al alloy and the same alloy reinforced with SiC particulates (SiCp) have been studied. To prepare superplastic test materials, a matrix alloy powder of composition 7.2Zn-2.4Mg-2Cu-0.2Zr-0.12Cr-0.2Co (Kaiser PM-64) and the powder mixed with 10 to 20 vol pct SiCp (~5 μm diameter) were thermomechanically processed to very fine equiaxed grain structures of ~6 μm and ~8 μm, respectively. Superplasticity in these materials was evaluated by characterizing (1) high temperature stability, (2) dynamic grain growth, (3) strain rate sensitivity, (4) flow stress behavior, (5) cavitation and cavitation control, and (6) total superplastic strain. It was observed that the PM-64 alloy could achieve a total elongation of over 800 pct, while the SiCp reinforced alloy could attain an elongation greater than 500 pct before failure. Also, it was shown that with the use of hydrostatic pressure during superplastic flow, cavitation could be controlled. Observations were made of the effect SiCp reinforcement particles had on the superplastic flow stress behavior. Interpretations are proposed to explain the role of particulates during superplastic straining.

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. V. Anand, A. J. Kaufman, and N. J. Grant:Rapid Solidification Processing—Principles and Technologies II, R. Mehrabian, B.H. Kear, and M. Cohen, eds., Claitor’s Pub. Div., Baton Rouge, LA, 1980, pp. 273–86.

    Google Scholar 

  2. J. W. Bohler, S. G. Roberts, and G. R. Chanani: Final Report, NSWC, Contract No. N60921-80-C-0238, June 1982.

  3. E. A. Starke, T. H.Sanders, and I. G. Palmer: J. of Metals, August 1981, pp. 24-33.

  4. C. Hammond:Superplastic Forming of Structural Alloys, N. E. Paton and C.H. Hamilton, eds., TMS-AIME, Warrendale, PA, 1982, pp. 131–45.

    Google Scholar 

  5. W. T. Chandler, A. K. Ghosh, and M. W. Mahoney:J. of Spacecraft and Rockets, Jan-Feb 1984, vol. 21(1), pp. 61–64.

    Article  CAS  Google Scholar 

  6. C. G. Rhodes, C. H. Hamilton, and N. E. Paton: AFML-TR-78-130, Sept. 1978.

  7. Mu Yeh Wu and Oleg D. Sherby:Scripta Metall., 1984, vol. 18, pp. 773–76.

    Article  CAS  Google Scholar 

  8. T. G. Nieh, C. A. Henshall, and J. Wadsworth:Scripta Metall., 1984, vol. 18, pp. 1405–08.

    Article  CAS  Google Scholar 

  9. M. W. Mahoney and A. K. Ghosh: U.S. Air Force Final Report, Contract No. AFWAL-TR-82-3052, August 1982.

  10. E. Nes:Zeit. Metallkunde., 1975, vol. 66, pp. 589–93.

    Google Scholar 

  11. U. E Nes:Acta Metall., 1976, vol. 24, pp. 391–98.

    Article  CAS  Google Scholar 

  12. F. J. Humphreys:Acta Metall., 1977, vol. 25, pp. 1323–44.

    Article  CAS  Google Scholar 

  13. N. E. Paton, C. H. Hamilton, J. Wert, and M. Mahoney:J. of Metals, Aug. 1982, vol. 34, No. 8, pp. 21–27.

    CAS  Google Scholar 

  14. A. K. Ghosh:Superplastic Forming of Structural Alloys, N. E. Paton and C.H. Hamilton, eds., TMS-AIME, Warrendale, PA, 1982, pp. 85–103.

    Google Scholar 

  15. A. K. Ghosh and C. H. Hamilton:Metall. Trans. A, 1979, vol. 10A, p. 699.

    Article  CAS  Google Scholar 

  16. M. W. Mahoney and C.H. Hamilton: Final Report, Contract No. AFWAL-TR-81-3051, June 1981.

  17. J. Gurland and J. Plateau:Trans, of the ASM, 1963, vol. 56, pp. 442–54.

    CAS  Google Scholar 

  18. F. A. Mohamed and M. I. Ahmed:Metall. Trans. A, 1977, vol. 8A, pp. 933–38.

    Article  CAS  Google Scholar 

  19. A. K. Ghosh and R. Raj:Acta Metall., 1981, vol. 29, pp. 607–16.

    Article  CAS  Google Scholar 

  20. M. F. Ashby and R. A. Verrall:Acta Metall., 1973, vol. 21, pp. 149–63.

    Article  CAS  Google Scholar 

  21. C. C. Bampton, M. W. Mahoney, C. H. Hamilton, A. K. Ghosh, and R. Raj:Metall. Trans. A, 1983, vol. 14A, p. 1583.

    Article  Google Scholar 

  22. C. H. Hamilton: U.S. Patent No. 4,354,369, Oct. 19, 1982.

Download references

Author information

Authors and Affiliations

  1. Rockwell International Science Center, 1049 Camino Dos Rios, 91360, Thousand Oaks, CA

    Murray W. Mahoney (Member, Technical Staff) & Amit K. Ghosh (Manager of Metals Processing)

Authors
  1. Murray W. Mahoney
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Amit K. Ghosh
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Mahoney, M.W., Ghosh, A.K. Superplasticity in a high strength powder aluminum Alloy with and without SiC Reinforcement. Metall Trans A 18, 653–661 (1987). https://doi.org/10.1007/BF02649481

Download citation

  • Received:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF02649481

Keywords

Search

Navigation