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Composition and stability of Ω phase in an Al-Cu-Mg-Ag Alloy

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Abstract

Transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDS) were employed to determine the stability and composition of the Ω phase in an Al-Cu-Mg-Ag alloy. It is shown that the Ω. phase can nucleate at isothermal aging temperatures up to 470 °C in the α + θ phase region of the Al-Cu phase diagram. Furthermore, Ω precipitates formed by aging solution-treated and quenched samples at 130 °C were found to exist after reversion treatments at temperatures close to the θ-phase solvus. The TEM/EDS analysis of relief-etched Ω, precip-itates shows that the composition of Ω phase is statistically the same as that of θ-Al2Cu phase in a binary Al-Cu alloy, with Ag and Mg below the limits of detectability. These results indicate that the Ω, phase is probably a metastable {111} variant of the equilibrium θ phase.

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References

  1. I.J. Polmear:Trans. TMS-A1ME, 1964, vol. 230, pp. 1331–39.

    CAS  Google Scholar 

  2. R.J. Chester and I.J. Polmear:Micron, 1980, vol. 11, pp. 311–12.

    CAS  Google Scholar 

  3. I.J. Polmear and M.J. Couper:Metall. Trans. A, 1988, vol. 19A, pp. 1027–35.

    Article  CAS  Google Scholar 

  4. J.H. Auld and J.T. Vietz: inThe Mechanisms of Phase Transformation in Crystalline Solids, The Institute of Metals, London, 1969, pp. 77–79.

    Google Scholar 

  5. R.J. Chester and I.J. Polmear: inThe Metallurgy of Light Alloys, Institute of Metallurgists, London, 1983, pp. 75–81.

    Google Scholar 

  6. S. Kerry and V.D. Scott:Met. Sci., 1984, vol. 18, pp. 289–94.

    Article  CAS  Google Scholar 

  7. J.H. Auld:Acta Crystallogr., 1972, vol. A28, p. 98S.

    Google Scholar 

  8. J.H. Auld:Mater. Sci. Technol., 1986, vol. 2, pp. 784–87.

    Article  CAS  Google Scholar 

  9. K.M. Knowles and W.M. Stobbs:Acta Crystallogr., 1988, vol. B44, pp. 207–27.

    Article  CAS  Google Scholar 

  10. B.C. Muddle and I.J. Polmear:Acta Metall. Mater., 1989, vol. 37, pp. 777–89.

    Article  CAS  Google Scholar 

  11. I.J. Polmear:Mater. Sci. Forum, 1987, vol. 13/14, pp. 195–214.

    Article  Google Scholar 

  12. A. Garg, Y.C. Chang, and J.M. Howe:Scripta Metall., 1990, vol. 24, pp. 677–80.

    Article  CAS  Google Scholar 

  13. Y.C. Chang: Ph.D. Thesis, Carnegie Mellon University, Pittsburgh, PA, 1992.

    Google Scholar 

  14. J.A. Taylor, B.A. Parker, and I.J. Polmear:Met. Sci., 1978, vol. 12, pp. 478–91.

    Article  CAS  Google Scholar 

  15. V.D. Scott, S. Kerry, and R.L. Trumper:Mater. Sci. Technol., 1987, vol. 3, pp. 827–35.

    Article  CAS  Google Scholar 

  16. R.W. Fonda, W.A. Cassada, and G. Shiflet:Acta Metall. Mater., 1992, vol. 40, pp. 2539–46.

    Article  CAS  Google Scholar 

  17. S.P. Ringer, B.C. Muddle, and I.J. Polmear: inProc. Third International Conf. on Aluminum Alloys, Norway, 1992, pp. 214–19.

  18. A. Garg and J.M. Howe:Acta Metall. Mater., 1991, vol. 39, pp. 1939–46.

    Article  CAS  Google Scholar 

  19. E.E. Havinga, H. Damsma, and P. Hokkeling:J. Less-Common Met., 1972, vol. 27, pp. 169–82.

    Article  CAS  Google Scholar 

  20. K.M. Knowles, F.M. Ross, and W.M. Stobbs:EMAG'87, Analytical Electron Microscopy, The Institute of Metals, London, 1988, pp. 55–58.

    Google Scholar 

  21. B.A. Shollock, C.R.M. Grovenor, and K.M. Knowles:Scripta Metall., 1990, vol. 24, pp. 1239–44.

    Article  CAS  Google Scholar 

  22. N. Sano, K. Hono, T. Sakurai, and K. Hirano:Seripta Metall., 1991, vol. 25, pp. 491–96.

    CAS  Google Scholar 

  23. R.H. Beton and E.C. Rollason:J. Inst. Met., 1957-58, vol. 86, pp. 77–85.

    CAS  Google Scholar 

  24. E. Hornbogen:Aluminum, 1967, vol. 43, pp. 115–21.

    CAS  Google Scholar 

  25. J.L. Murray:Inter. Met. Rev., 1985, vol. 30, pp. 211–33.

    Article  CAS  Google Scholar 

  26. M. Ryvola and L.R. Morris: inMicrostructural Science, Elsevier, New York, 1977, vol. 5, pp. 203–08.

    Google Scholar 

  27. J.M. Howe:Metallography, 1983, vol. 16, pp. 275–86.

    Article  CAS  Google Scholar 

  28. K.C. Thompson-Russel and J.W. Edington: inPractical Electron Microscopy in Materials Science, Monograph 5, Philips Gloeilampenfabrieken, Holland, 1977, pp. 12–15.

    Google Scholar 

  29. G. Cliff and G.W. Lorimer: inProc. 5th European Congress on Electron Microscopy, Institute of Physics, London, 1972, p. 140.

    Google Scholar 

  30. G. Cliff and G.W. Lorimer:J. Microsc, 1975, vol. 103, pp. 203–07.

    Article  Google Scholar 

  31. J.E. Wood, D.B. Williams, and J.I. Goldstein:J. Microsc, 1984, vol. 133, pp. 255–74.

    Article  CAS  Google Scholar 

  32. D.C. Joy, A.D. Romig, Jr., and J.I. Goldstein: inPrinciples of Analytical Electron Microscopy, Plenum Press, New York, 1986, pp. 171 and 87.

    Book  Google Scholar 

  33. D. Vaughan and J.M. Silcock:Phys. Status Solidi, 1967, vol. 20, pp. 725–36.

    Article  CAS  Google Scholar 

  34. A. Garg and J.M. Howe:Acta Metall. Mater., 1992, vol. 40, pp. 2451–62.

    Article  CAS  Google Scholar 

  35. G.J. Mahon, J.M. Howe, and A.K. Vasudevan:Acta Metall. Mater., 1990, vol. 38, pp. 1503–12.

    Article  CAS  Google Scholar 

  36. ASM Metals Handbook, 8th ed., ASM, Metals Park, OH, 1973, vol. 8, p. 386.

  37. J.M. Silcock, T.J. Heal, and H.K. Hardy:J. Inst. Met., 1953, vol. 82, pp. 239–48.

    Google Scholar 

  38. K.C. Russell: in Phase Transformations, ASM, 1968, pp. 219–68.

  39. J.W. Cahn:Acta Metall., 1961, vol. 9, pp. 795–801.

    Article  CAS  Google Scholar 

  40. F.K. LeGoues, R.N. Wright, Y.W. Lee, and H.I. Aaronson:Acta Metall., 1984, vol. 32, pp. 1865–1870.

    Article  CAS  Google Scholar 

  41. W.A. Soffa, private communication, 1992.

  42. A.J. Bradley and P. Jones:J. Inst. Met., 1933, vol. 51, pp. 131–57.

    Google Scholar 

  43. J.B. Friauf:J. Am. Chem. Soc., 1927, vol. 49, pp. 3107–14.

    Article  CAS  Google Scholar 

  44. S.K. Seshadri and D.B. Downie:Met. Sci., 1979, vol. 13, pp. 696–98.

    Article  CAS  Google Scholar 

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Authors and Affiliations

  1. Department of Materials Science and Engineering, School of Engineering and Applied Science, University of Virginia, 22903-2442, Charlottesville, VA

    Y. C. Chang (Associate Professor)

  2. Aeronautical Research Laboratory/CSIST, Taichung, Taiwan, People’s Republic of China

    J. M. Howe

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  1. Y. C. Chang
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  2. J. M. Howe
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Formerly Graduate Research Assistant, Department of Materials Science and Engineering, University of Virginia, Scientist

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Chang, Y.C., Howe, J.M. Composition and stability of Ω phase in an Al-Cu-Mg-Ag Alloy. Metall Trans A 24, 1461–1470 (1993). https://doi.org/10.1007/BF02646587

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