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Oxidation of Metals

, Volume 68, Issue 1–2, pp 65–76 | Cite as

TEM Study of the Initial Oxidation of Ti42Al48Cr8Ag2

  • Changyou Guo
  • Caibei Zhang
  • Wei Lu
  • Lianlong He
  • Yanjun Xi
  • Fuhui Wang
Original Paper

Abstract

A microstructural investigation of oxide scales was carried out by analytical electron microscope (AEM) after the as-cast Ti42Al48Cr8Ag2 alloy was exposed to air at 1,173 K for 5, 30 and 180 min, respectively. The results indicated that the formation of oxide scale experiences a transformation from ternary-layer system consisting of an outmost rutile (TiO2-rich) layer, mid amorphous alumina and inner nitrides to a double-layer of TiO2 and Al2O3-rich with increasing time from 5 to 30 min. In the subsurface zone, a change was also found a metastable Cr-rich new phase with bcc structure of a = 1.371 nm formed in addition to the oxidation for X-phase during 30 min. After 180 min, a continuous Laves-phase layer formed instead at the same position. In addition, the process revealed that amorphous alumina changed to a metastable structure before stable α-Al2O3 formed.

Keywords

Ti42Al48Cr8Ag2 alloy AEM Oxidation Nitrides New phase 

References

  1. 1.
    S. A. Kekare and P. B Aswath, Journal of Material Science 32, 2485–2499 (1997).CrossRefGoogle Scholar
  2. 2.
    A. Rahmel, W. J. Quadakkers and M. Schütze, Materials and Corrosion 46, 271–285 (1995).CrossRefGoogle Scholar
  3. 3.
    S. Becker, A. Rahmel and M. Schutze, Oxidation of Metals. 38, 425–464 (1992).CrossRefGoogle Scholar
  4. 4.
    Y. Shida and H. Anada, Oxide Metal. 45, 197–219 (1996).CrossRefGoogle Scholar
  5. 5.
    J. W. Fergus, Materials Science and Engineering A 338, 108–125 (2002).CrossRefGoogle Scholar
  6. 6.
    S. Taniguchi, Materials and Corrosion 48, 1–9 (1997).CrossRefGoogle Scholar
  7. 7.
    M. P. Brady, J. L. Smialek, J. Smith and D. L. Humphrey, Acta Mater 45, 2357–2369 (1997).CrossRefGoogle Scholar
  8. 8.
    M. P. Brady, J. L. Smialek, D. L. Humphrey and J. Smith, Acta Mater. 45, 2371–2382 (1997).CrossRefGoogle Scholar
  9. 9.
    J. M. Rakowski, F. S. Pettit, G. H. Meier, F. Dettenwanger, E. Schumann and M. Ruhle, Scripta Metallurgica Et Materialia 33, 997–1003 (1995).CrossRefGoogle Scholar
  10. 10.
    T. Zhaolin and W. Fuhui, The Chinese Journal of Nonferrous Metals 8, 245–249 (1998).Google Scholar
  11. 11.
    Z. Tang, V. Shemet, L. Niewolak, L. Singheiser and W. J. Quadakkers, Intermetallics 11, 1–8 (2004).CrossRefGoogle Scholar
  12. 12.
    Z. Tang, L. Niewolak, V. Shemet, L. Singheiser, W. J. Quadakkers, F. Wang, W. Wu and A. Gil, Material Science and Engineering 328A, 297–301 (2002).CrossRefGoogle Scholar
  13. 13.
    C. Lang and M. Schutze, Oxide Metal 46, 255–285 (1996).CrossRefGoogle Scholar
  14. 14.
    M. Tinker and P. A. Labun, Oxidation of Metals 18, 27–40 (1982).CrossRefGoogle Scholar
  15. 15.
    Robert J. Keyse, Anthony J. Garratt-Reed, Peter J. Goodhew, Goodon W. Lorimer. Introduction to Scanning Transmission Electron Microscopy (Springer, 1998).Google Scholar
  16. 16.
    M. P. Brady, J. L. Smialek and F. Terepka, Scripta Metallurgica Et Materialia 32, 1659–1664 (1995).CrossRefGoogle Scholar
  17. 17.
    J. Doychak, J. L. Smialek and T. E. Mitchell, Metallurgical Transactions A 20, 499–518 (1989).Google Scholar
  18. 18.
    J. C. Yang, E. Schumann, I. Levin and M. Rühle, Acta Materialia 46, 2195–2201 (1998).CrossRefGoogle Scholar
  19. 19.
    X. Yanjun, H. Lianlong and W. Fuhui, Journal of Chinese society for corrosion and protection 25, 135–141 (2005).Google Scholar
  20. 20.
    N. Zheng, W. Fischer, H. Grubmeier, V. Shemet and W. J. Quadakkers, Scipta Metallurgica Et Materialia 33, 47–53 (1995).CrossRefGoogle Scholar
  21. 21.
    N. Zheng, W. J. Quadakkers, A. Gil and H. Nickel, Oxide Metal 40, 477–499 (1995).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Changyou Guo
    • 1
    • 2
  • Caibei Zhang
    • 1
  • Wei Lu
    • 2
  • Lianlong He
    • 2
  • Yanjun Xi
    • 3
  • Fuhui Wang
    • 2
  1. 1.College of Sciences, Northeastern UniversityShenyangChina
  2. 2.Institute of Metal ResearchChinese Academy of SciencesShenyangChina
  3. 3.Zhongyuan University of TechnologyZhengzhouChina

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