Metallurgical Transactions A

, Volume 12, Issue 11, pp 1939–1943 | Cite as

The effect of copper content and heat treatment on the stress corrosion characteristics of Ai-6Zn-2Mg-X Cu alloys

  • B. Sarkar
  • M. Marek
  • E. A. Starke
Environmental Interactions


The effect of copper and aging on the stress corrosion characteristics of Al-6 pct Zn-2 pct Mg-(0.01-2.1) pct Cu alloys in 3.5 pct NaCl was studied with other variables remaining constant. In the peak-strength condition the crack velocity in the stress-independent region decreased by two orders of magnitude when copper was increased from 0.01 to 2.1 pct. In the stress-dependent region crack velocity decreased only for copper contents higher than 1 pct. Overaging further reduced the plateau crack velocity in all the alloys studied. The results are interpreted on the basis of the effects of copper and aging on the deformation mechanism and electrochemical activity of the phases.


Crack Growth Rate Stress Corrosion Stress Corrosion Crack Copper Content Crack Velocity 
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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    M. O. Speidel:The Theory of Stress Corrosion Cracking in Alloys, J. C. Scully, ed., p. 289, NATO, Brussels, 1971.Google Scholar
  2. 2.
    M. O. Speidel:Metall. Trans. A., 1975, vol. 6A, p. 631.Google Scholar
  3. 3.
    E. H. Dix, R. H. Brown, and W. W. Binger:Metals Handbook, 8th ed., T. Lyman, ed., vol. 1, ASM, Metals Park, OH, 1961, p. 916.Google Scholar
  4. 4.
    R. J. Gest and A. R. Troiano:Corrosion, 1974, vol. 30, p. 274.Google Scholar
  5. 5.
    H. A. Holl:Corrosion, 1967, vol. 23, p. 274.Google Scholar
  6. 6.
    D. J. Duquette:Corrosion Fatigue, O. Devereux, A. J. Mc-Evily, and R. W. Staehle, eds., p. 12, NACE, Houston, TX, 1972.Google Scholar
  7. 7.
    Fu-Shiong Lin and E. A. Starke, Jr.:Mater. Sci. Eng., 1979, vol. 39, p. 27.CrossRefGoogle Scholar
  8. 8.
    T. H. Sanders, Jr. and E. A. Starke, Jr.:Metall. Trans. A., 1976, vol. 7A, p. 1407.Google Scholar
  9. 9.
    E. A. Starke, Jr. and G. Lütjering:Fatigue and Microstructure, ASM, Metals Park, OH, 1979, p. 205.Google Scholar
  10. 10.
    E. A. Starke, Jr.:Mater. Sci. Eng., 1977, vol. 29, p. 99.CrossRefGoogle Scholar
  11. 11.
    J. E. Hilliard:Recrystallization, Grain Growth and Texture, ASM, Metals Park, OH, 1965, p. 267.Google Scholar
  12. 12.
    Annual Book of ASTM Standards, Part 10, 1976, ASTM, Philadelphia, PA, p. 120.Google Scholar
  13. 13.
    G. Lütjering: Private Communication, Ruhr-Universität Bochum, W. Germany, 1978.Google Scholar
  14. 14.
    Fu-Shiong Lin and E. A. Starke, Jr.:Mater. Sci Eng., 1980, vol. 43, p. 165.Google Scholar
  15. 15.
    J. H. Mulherin:Stress Corrosion Testing, STP 425, ASTM, Philadelphia, PA, 1967, p. 66.Google Scholar
  16. 16.
    G. C. English and E. H. Hollingsworth: Report No. W-66-029-C, Alcoa Research Laboratories, new Kensington, PA, May 1968.Google Scholar
  17. 17.
    J. Busby, J. F. Cleave, and R. L. Cudd:J. Inst. Metals, 1971, vol. 99, p. 41.Google Scholar
  18. 18.
    P. K. Poulose, J. E. Morral, and A. J. McEvily:Metall. Trans., 1974, vol. 5, p. 1393.Google Scholar
  19. 19.
    P. Doig and J. W. Edington:Metall. Trans. A., 1975, vol. 6A, p. 943.Google Scholar
  20. 20.
    J. M. Chen, T. S. Sun, R. K. Viswanadham, and J. A. S. Green:Metall. Trans. A., 1974, vol. 8A, p. 1935.Google Scholar
  21. 21.
    P. Doig, P. E. J. Flewitt, and J. W. Edington:Corrosion, 1977, vol. 33, p. 217.Google Scholar
  22. 22.
    M. O. Speidel:Stress Corrosion Cracking in High Strength Steels and in Titanium and Aluminum Alloys, B. F. Brown, ed., NRL, Washington, 1972, p. 147.Google Scholar

Copyright information

© American Society for Metals and the Metallurgical Society of AIME 1981

Authors and Affiliations

  • B. Sarkar
    • 1
  • M. Marek
    • 2
  • E. A. Starke
    • 2
  1. 1.Exxon Enterprises, Materials DivisionOld Buncombe at PoplarGreer
  2. 2.Fracture & Fatigue Research Laboratory, School of Chemical EngineeringGeorgia Institute of TechnologyAtlanta

Personalised recommendations