Abstract
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.
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M. O. Speidel:The Theory of Stress Corrosion Cracking in Alloys, J. C. Scully, ed., p. 289, NATO, Brussels, 1971.
M. O. Speidel:Metall. Trans. A., 1975, vol. 6A, p. 631.
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.
R. J. Gest and A. R. Troiano:Corrosion, 1974, vol. 30, p. 274.
H. A. Holl:Corrosion, 1967, vol. 23, p. 274.
D. J. Duquette:Corrosion Fatigue, O. Devereux, A. J. Mc-Evily, and R. W. Staehle, eds., p. 12, NACE, Houston, TX, 1972.
Fu-Shiong Lin and E. A. Starke, Jr.:Mater. Sci. Eng., 1979, vol. 39, p. 27.
T. H. Sanders, Jr. and E. A. Starke, Jr.:Metall. Trans. A., 1976, vol. 7A, p. 1407.
E. A. Starke, Jr. and G. Lütjering:Fatigue and Microstructure, ASM, Metals Park, OH, 1979, p. 205.
E. A. Starke, Jr.:Mater. Sci. Eng., 1977, vol. 29, p. 99.
J. E. Hilliard:Recrystallization, Grain Growth and Texture, ASM, Metals Park, OH, 1965, p. 267.
Annual Book of ASTM Standards, Part 10, 1976, ASTM, Philadelphia, PA, p. 120.
G. Lütjering: Private Communication, Ruhr-Universität Bochum, W. Germany, 1978.
Fu-Shiong Lin and E. A. Starke, Jr.:Mater. Sci Eng., 1980, vol. 43, p. 165.
J. H. Mulherin:Stress Corrosion Testing, STP 425, ASTM, Philadelphia, PA, 1967, p. 66.
G. C. English and E. H. Hollingsworth: Report No. W-66-029-C, Alcoa Research Laboratories, new Kensington, PA, May 1968.
J. Busby, J. F. Cleave, and R. L. Cudd:J. Inst. Metals, 1971, vol. 99, p. 41.
P. K. Poulose, J. E. Morral, and A. J. McEvily:Metall. Trans., 1974, vol. 5, p. 1393.
P. Doig and J. W. Edington:Metall. Trans. A., 1975, vol. 6A, p. 943.
J. M. Chen, T. S. Sun, R. K. Viswanadham, and J. A. S. Green:Metall. Trans. A., 1974, vol. 8A, p. 1935.
P. Doig, P. E. J. Flewitt, and J. W. Edington:Corrosion, 1977, vol. 33, p. 217.
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.
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Sarkar, B., Marek, M. & Starke, E.A. The effect of copper content and heat treatment on the stress corrosion characteristics of Ai-6Zn-2Mg-X Cu alloys. Metall Trans A 12, 1939–1943 (1981). https://doi.org/10.1007/BF02643806
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DOI: https://doi.org/10.1007/BF02643806