Skip to main content
SpringerLink
Log in

Evidence of a thin sheet toughening mechanism in Al−Fe−X alloys

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

Abstract

A toughening mechanism, dubbed thin sheet toughening, is proposed for improving the fracture resistance (K IC and tearing modulus) of powder-metallurgy alloys of limited ductility. The basis of this approach is the recognition that internal delamination of thick-section components or cracked specimens into thin sheet ligaments in the fracture process zone leads to a drastic reduction in triaxial stresses, with the consequence of enhancing the critical fracture strain, fracture toughness (K IC orJ IC ), and tearing modulus. Theoretical analyses indicate that a factor of\(\sqrt 3 \), increase in theK IC value, and even greater increases in the tearing modulus are possible for idealized conditions. The predicted results are compared with experimental results of tensile,K IC , andJ tests conducted on four powder-metallurgy Al−Fe−X alloys at 25 and 316°C. The comparison reveals that thin sheet toughening is a contributor to the highK IC value observed in a state-of-the-art Al−Fe−V−Si alloy. Increasing the critical strain to fracture is also shown to be a possible method to improve the fracture toughness of Al−Fe−X alloys, independent of the thin sheet toughening effect.

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. R.O. Ritchie and R.M. Cannon: Lawrence Berkeley Laboratory, University of California, Berkeley, Report No. LBL-20656, 1985.

  2. R. Wills, M. Pascucci, and F. Jelinek: MCIC Report, MCIC-86-51, 1986.

  3. A.G. Evans and A.H. Heuer:J. Am. Ceram. Soc., 1980, vol. 63, pp. 241–48.

    Article  CAS  Google Scholar 

  4. R.M. McMeeking and A.G. Evans:J. Am. Ceram. Soc., 1982, vol. 65, pp. 242–46.

    Article  Google Scholar 

  5. B. Budiansky, J.W. Hutchinson, and J.C. Lambropoulous:Int. J. Solids Structure, 1983, vol. 19, pp. 337–55.

    Article  Google Scholar 

  6. R.G. Hoagland and J.D. Embury:J. Am. Ceram. Soc., 1980, vol. 63, pp. 404–10.

    Article  CAS  Google Scholar 

  7. D.B. Marshall and A.G. Evans:J. Am. Ceram. Soc., 1985, vol. 68, pp. 225–31.

    Article  CAS  Google Scholar 

  8. A.G. Evans and K.T. Faber:J. Am. Ceram. Soc., 1981, vol. 67, pp. 394–98.

    Article  Google Scholar 

  9. T.S. Oh, R.M. Cannon, and R.O. Ritchie: TMS-AIME Fall Meeting, Cincinnati, OH, unpublished research, 1987.

  10. D. Eylon and Y.W. Kim: AFWAL-TR-86-4005, 1986.

  11. C.M. Adam, R.G. Bourdeau, J.W. Bizoch, and A.R. Cox: DARPA Contract No. F33615-76-C-5136, Technical Report, May 1980.

  12. R.Z. Sanders, G.J. Hildeman, and D.J. Lege:Elevated Temperature Aluminum Development, Technical Report for the Period March 29, 1978 to March 28, 1979, Air Force Materials Laboratory, Contract No. F33615-77-C-5086.

  13. R.E. Sanders and G.J. Hildeman: Final Report, Air Force Contract No. F33615-77-C-5086, 1981.

  14. S.L. Langenbeck and R.A. Rainen: AFWAL-TR-86-4027, 1986.

  15. J.C. Ekvall, S.L. Langenbeck, J.M. Cox, and F.T. McQuilkin:Elevated Temperature Powdered Aluminum Airframe Structures, Interim Technical Report (LR30668), Air Force Contract No. F33615-81-C-5096, 1984.

  16. S.D. Kirchoff, R.H. Young, W.M. Griffith, and Y.W. Kim: inHigh Strength Powder Metallurgy Aluminum Alloys, M.J. Koczak and G.J. Hildeman, eds., TMS/AIME, 1982, pp. 237–48.

  17. D.J. Skinner and K. Okazaki:Scripta Metall., 1984, vol. 18, pp. 905–09.

    Article  CAS  Google Scholar 

  18. A.M. Brown, D.J. Skinner, D. Raybould, S.K. Das, R.L. Bye, and C.M. Adam:Proceedings of Int. Conf. on Aluminum Alloys, June 15–20, Charlottesville, VA, 1986.

  19. D.J. Skinner, R.L. Bye, D. Raybould, and A.M. Brown:Scripta Metall., 1986, vol. 20, pp. 867–72.

    Article  CAS  Google Scholar 

  20. R.H. Graham and F.R. Billman: presented at the WESTEC ’87, Los Angeles, CA, March 23 through 26, 1987.

  21. K.S. Chan:Proceedings of the TMS-AIME Symposium on Dispersion Strengthened Aluminum Alloys, W.M. Griffith and Y.W. Kim, eds., AIME Annual Meeting, Phoenix, AZ, 1988, in press.

  22. D. Broek:Elementary Engineering Fracture Mech., Sigtoff & Noordhoff, The Netherlands, 1978, ch. 8, pp. 181–214.

    Google Scholar 

  23. R.W. Hertzberg,Deformation and Fracture Mechanics of Engineering Materials, John Wiley & Sons, 1976, ch. 10, pp. 327–35.

  24. J.D. Embury, N.J. Petch, A.E. Wraith, and E.S. Wright:Trans. AIME, 1967, vol. 239, pp. 114–18.

    CAS  Google Scholar 

  25. J.R. Rice, W.J. Drugan, and T.L. Sham:ASTM STP 700, ASTM, Philadelphia, PA, 1980, pp. 189–221.

    Google Scholar 

  26. G.T. Hahn and A.R. Rosenfield:Metall. Trans. A, 1975, vol. 6A, pp. 653–70.

    CAS  Google Scholar 

  27. G.G. Garrett and J.F. Knott:Metall. Trans. A., 1987, vol. 8A, pp. 1187–201.

    Google Scholar 

  28. C.Q. Chen and J.F. Knott:Met. Science., 1981, vol. 15, pp. 357–64.

    Article  CAS  Google Scholar 

  29. J.W. Martin:Micromechanisms in Particle-Hardened Alloys, Cambridge University Press, London, 1980, pp. 127–38.

    Google Scholar 

  30. G.T. Hahn and A.R. Rosenfield:ASTM STP 432, ASTM, Philadelphia, PA, 1986, pp. 5–32.

    Google Scholar 

  31. J.W. Hutchinson:J. Mech. Phys. of Solids, 1968, vol. 16, pp. 13–31.

    Article  Google Scholar 

  32. J.R. Rice and G.F. Rosengren:J. Mech. Phys. of Solids, 1968, vol. 16, pp. 1–12.

    Article  Google Scholar 

  33. R.M. McMeekingJ. Mech. Phys. of Solids, 1977, vol. 25, pp. 357–81.

    Article  CAS  Google Scholar 

  34. D.M. Norris, J.E. Reaugh, B. Moran, and D.F., Quiñnes:J. Eng. Mat. & Tech., 1978, vol. 100, pp. 279–86.

    CAS  Google Scholar 

  35. K.S. Chan and A.K. Miller:Proceedings of the ASME Int. Conf. on Ad. In Life Prediction Methods, Albany, NY, 1983, pp. 1–16.

  36. C.F. Shih:J. Mech. Phys. of Solids, 1981, vol. 29, pp. 305–26.

    Article  Google Scholar 

  37. ASTM E399 and E813-81:Annual Book of ASTM Standard, ASTM, Philadelphia, PA, 1983, pp. 518–53, pp. 762–86.

  38. H. Jones:Mat. Sci. and Eng., 1969 through 1970, vol. 5, pp. 1–18.

    Article  CAS  Google Scholar 

  39. K.T. Venkateswara Rao, W. Yu, and R.O. Ritchie:Metall. Trans. A, 1988, vol. 19A, pp. 549–61.

    Google Scholar 

  40. K.S. Chan:Acta Metall., 1988, in press.

Download references

Author information

Authors and Affiliations

  1. Southwest Research Institute, 78284, San Antonio, TX

    Kwai S. Chan (Principal Engineer)

Authors
  1. Kwai S. Chan
    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

Chan, K.S. Evidence of a thin sheet toughening mechanism in Al−Fe−X alloys. Metall Trans A 20, 155–164 (1989). https://doi.org/10.1007/BF02647502

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF02647502

Keywords

Search

Navigation