Hostname: page-component-7b7567c8c-fvjsw Total loading time: 0 Render date: 2026-11-13T10:01:07.406Z Has data issue: false hasContentIssue false
  • English
  • Français

Interdiffusion and Phase Behavior in Polysynthetically Twinned (PST) TiAl / Ti Diffusion Couples

Published online by Cambridge University Press:  21 March 2011

Ling Pan and
David E. Luzzi
Ling Pan
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, PA 19104, U.S.A
David E. Luzzi
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, PA 19104, U.S.A
Get access

Abstract

Diffusion couples of pure Ti and polysynthetically twinned (PST) TiAl (49.3 at.% Al) were prepared by high vacuum hot-pressing, with the bonding interface perpendicular to the lamellar planes. Diffusion experiments were carried out by annealing the couples in the same furnace at 650, 700 and 850°C for various times. The cross-section of the couple was studied using scanning electron microscopy (SEM) and quantitative wavelength-dispersive x-ray spectroscopy (WDS). A reaction layer whose composition is close to that of the stoichiometric α2-Ti3Al phase formed along the PST TiAl / Ti bonding interface in PST TiAl side. Direct measurements of the thickness of the reaction zone were performed at different phase regions and various boundaries. By assuming the thickness of the reaction zone increases as (Dt)1/2, where D is the diffusion coefficient and t is the annealing time, the diffusion coefficients at these temperatures were calculated. Composition profiles in the reaction zone, along the lamellae and at the lamellar interfaces were obtained by WDS analyses.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000, N5.53.1
Copyright
Copyright © Materials Research Society 2001

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable

References

REFERENCES

1. Froes, F. H. and Suryanarayana, C., in Physical Metallurgy and Processing of Intermetallic Compounds, Stoloff, N. S. and Sikka, V. K., ed., Chapman & Hall, New York, 1996, Chapter 8.Google Scholar
2. Huang, S. C. and Chesnutt, J. C., in Intermetallic Compounds: Vol. 2, Practice, Westbrook, J. H. and Fleischer, R. L., ed., John Wiley & Sons, 1994, Chapter 4.Google Scholar
3. Horton, J., Hanada, S., Baker, I., Noebe, R. D. and Schwartz, D., ed., High Temperature Ordered Intermetallic Alloys VI (MRS, Pittsburgh, 1995), 364.Google Scholar
4. Baker, I., Darolia, R., Whittenberger, J. D. and Yoo, M. H., ed., High Temperature Ordered Intermetallic Alloys V (MRS, Pittsburgh, 1993), 288.Google Scholar
5. Pope, D. P., Liu, C. T. and Whang, S. H., ed., High Temperature Intermetallics, Mater. Sci. Eng. A 192/193 (1995).Google Scholar
6. Blackburn, M. J., in The Science, Technology and Application of Titanium, Eds. Jaffee, R. I. and Promisel, N. E., Pergamon, London (1970) 633.Google Scholar
7. Umeda, H., Kishida, K., Inui, H. and Yamaguchi, M., Mater. Sci. Eng. A 239–240 (1997) 336.Google Scholar
8. Hall, E. L. and Huang, S. C., J. Mater. Res. 4 (1989) 595.Google Scholar
9. Kim, Y. W., J. Metall. 46(7) (1994) 30.Google Scholar
10. Kim, Y. W., Mater. Sci. Eng. A 192/193 (1995) 519.Google Scholar
11. Hsiung, L. M. and Nieh, T. G., Mater. Sci. Eng. A 239–240 (1997) 438.Google Scholar
12. Maruyama, K., Yamamoto, R., Nakakuki, H. and Fujitsuna, N., Mater. Sci. Eng. A 239–240 (1997) 419.Google Scholar
13. Breuer, J., Wilger, T., Friesel, M. and Herzig, Chr., Intermetallics 7 (1999) 381.Google Scholar
14. Herzig, Chr., Przeorski, T. and Mishin, Y., Intermetallics 7 (1999) 389.Google Scholar
15. Rüsing, J. and Herzig, Chr., Intermetallics 4 (1996) 647.Google Scholar
16. Herzig, Chr., Friesel, M., Derdau, D. and Divinski, S. V., Intermetallics 7 (1999) 1141.Google Scholar
17. Kaur, I., Mishin, Y. and Gust, W., Fundamentals of Grain and Interphase Boundary Diffusion, John Wiley & Sons, Chichester, 1995.Google Scholar