The Effects of Copper and Chromium on the Aging Response of Dilute Al-Mg-Si Alloys
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We appreciate helpful discussions on this topic with I.M. Bernstein. The work was sponsored by the National Science Foundation under Grant No. DMR78-00723. REFERENCES 1. I.M. Bernstein and A.W. Thompson: Int. Metals Reviews, 1976, vol. 21, pp. 269-87. 2. A.W. Thompson and I. M. Bernstein: Advances in Corrosion Science and Technology, M . G . Fontana and R.W. Staehle, eds., Plenum, New York, NY, 1980, vol 7, pp. 53-175. 3. R. Garber and I . M . Bernstein: Environmental Degradation of Engmeering Materials, M. R. Louthan and R. P. McNitt, eds., V. P. I. Press, Blacksburg, VA, 1977, pp. 463-73. 4. J.E. Costa and A W. Thompson: Metall. Trans. A, 1981, vol. 12A, pp. 761-71. 5. Y.-J. Park and I . M . Bernstein: Rail Steels--Developments, Processing, and Use, D.H. Stone and G. G. Knupp, eds , STP 644, ASTM, Philadelphia, PA, 1978, pp. 287-302 6. Y.-J. Park and I.M. Bernstein: Metall. Trans. A, 1979, vol. 10A, pp. 1653-64. 7. J.R. Griffiths and D . R . J . Owen: J. Mech. Phys. Solids, 1971, vol. 19, pp. 419-31 8. T.D. Lee, T. Goldenberg, and J.P. Hirth. Metall. Trans. A, 1978, vol. 9A, pp. 1663-71. 9. A.R. Rosenfield, G . T Hahn, and J.D. Embury: Metall. Trans., 1972, vol. 3, pp. 2797-2804. 10. A.W. Thompson and J . C . Chesnutt: Metall. Trans. A, 1979, vol. 10A, pp. 1193-96. 11. A.W. Thompson and 1. M. Bernsteln: Hydrogen m Metals, Proc. 2nd Int. Congress, paper 3A6, Pergamon, New York, NY, 1977. 12. J.F. Knott: Fundamentals of Fracture Mechanics, Butterworths, London, 1973, ch. 7.
The Effects of Copper and Chromium on the Aging Response of Dilute AI-Mg-Si Alloys R.J.
LIVAK
An important consideration in the processing and fabrication of the heat-treatable aluminum alloys is the critical cooling rate from the solution temperature necessary to minimize coarse precipitation of the low-temperature phase. The relative quench sensitivity of age-hardening alloys such R.J. LIVAK, formerly with Washington State University, Pullman, WA, is now Senior Research Metallurgist with the Specialty Metals unit of Pfizer, Inc., 21 Toelles Road, Wallingford, CT 06492. Manuscript submitted July 30, 1981.
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as AI-Mg-Si and AI-Zn-Mg refers to the diminution of peak aged strength resulting from the precipitation of the equilibrium phase during slow cooling after solutionizing. Quench sensitive alloys require more critical control of the thermal processing parameters and may show loss of mechanical strength if subjected to elevated temperature excursions during fabrication. Improved production efficiencies for these alloys can be realized by minimizing the quench sensitivity effect. A dilute AI-Mg-Si alloy has been developed that may be slowly air cooled without significant decrease in the aged strength and that achieves tensile properties after artificial aging comparable to AA 6063 at a lower solute content. The following factors were considered in designing the alloy composition. For a given strength level, the Mg content is minimized by using a slight excess Si content (0.2 to 0.3 pct more Si than needed for a ba
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