High-Temperature Environmental Embrittlement of Thermomechanically Processed TiAl-Based Intermetallic Alloys with Various Kinds of Microstructures

Abstract

Thermomechanically processed TiAl-based intermetallic alloys with various alloy compositions and microstructures were tensile tested in various environmental media including air, water vapor and a mixture gas of 5vol.%H2+Ar as a function of temperature. All the TiAl-based intermetallic alloys showed reduced tensile fracture stress (or elongation) in air, water vapor and a mixture gas of 5vol.%H2+Ar not only at ambient temperature (RT~600K) but also at high temperature mostly from 600K to 1000K (sometimes higher temperature than 1000K). The high-temperature environmental embrittlement of TiAl-based intermetallic alloy depended upon the microstructure. The possible species causing the high-temperature environmental embrittlement are hydrogen atoms decomposed from water vapor (H2O) or hydrogen gas (H2), similar to those causing the low-temperature environmental embrittlement.

This is a preview of subscription content, access via your institution.

References

  1. 1.

    S. C. Huang and J. C. Chesnutt, Intermetallic Compounds, Volume 2, Practice, ed. J. H. Westbrook and R. L. Fleischer, (John Wiley and Sons, 1995), pp. 73–90.

  2. 2.

    D. E. Matejczyk and C. G. Rhode, Scripta Metall. 24, 1369 (1990).

    CAS  Article  Google Scholar 

  3. 3.

    W. Y. Chu and A. W. Thompson, Scripta Metall, 25, 2133 (1991).

    CAS  Article  Google Scholar 

  4. 4.

    K. S. Chan and Y.–W Kim, Metall. Trans. A, 23, 1663 (1992).

    Article  Google Scholar 

  5. 5.

    W. Y. Chu and A. W. Thompson, Metall. Trans. A, 23, 1299 (1992).

    Article  Google Scholar 

  6. 6.

    K. W. Gao, W. Y. Chu, Y. B. Wang and C. M. Hsiao, Scripta Metall, 27, 555 (1992).

    CAS  Article  Google Scholar 

  7. 7.

    T. Takasugi and S. Hanada, J. Mater. Research, 17, 1739 (1992).

    Google Scholar 

  8. 8.

    C. T. Liu and Y.–W. Kim, Scripta Metall. 27, 599 (1992).

    CAS  Article  Google Scholar 

  9. 9.

    M. Nakamura, K. Hashimoto, T. Tsujimoto and T. Suzuki, J. Mater. Res. 8, 68 (1993).

    CAS  Article  Google Scholar 

  10. 10.

    M. Nakamura, N. Itoh, K. Hashimoto, T. Tsujimoto and T. Suzuki, Metall. Trans. A 25, 321 (1994).

    Article  Google Scholar 

  11. 11.

    T. Tsuyumu, Y. Kaneno, H. Inoue and T. Takasugi, Metall. Mater. Trans. A 34, 645 (2003).

    Article  Google Scholar 

  12. 12.

    K.–W. Gao and M. Nakamura, Mater. Sci. Eng. A, 325, 66 (2002).

    Article  Google Scholar 

  13. 13.

    K.–W. Gao and M. Nakamura, Interemetallics, 10, 233 (2002).

    CAS  Article  Google Scholar 

  14. 14.

    M. Nakamura, E. Abe, K. Gao, L. Qiao and W. Chu, ISIJ International, 43, 489 (2003).

    CAS  Article  Google Scholar 

  15. 15.

    T. Takasugi and O. Izumi, Acta Metallurgica, 34, 607 (1986).

    CAS  Article  Google Scholar 

  16. 16.

    C. T. Liu, 6th Int. Symp. Intermetallic Compounds - Structure and Mechanical Properties, ed. O. Izumi, (JIM, 1991) pp. 703–712.

Download references

Acknowledgments

This work was supported in part by the New Energy and Industrial Technology Development Organization (NEDO) through Ministry of Economy, Trade and Industry (METI). One of the authors (T.T.) gratefully acknowledges the financial support by the Light Metals Educational Foundation of Japan.

Author information

Affiliations

Authors

Corresponding author

Correspondence to T. Takasugi.

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Takasugi, T., Hotta, Y., Shibuya, S. et al. High-Temperature Environmental Embrittlement of Thermomechanically Processed TiAl-Based Intermetallic Alloys with Various Kinds of Microstructures. MRS Online Proceedings Library 842, 351–356 (2004). https://doi.org/10.1557/PROC-842-S5.45

Download citation