Hostname: page-component-cd9895bd7-lnqnp Total loading time: 0 Render date: 2024-12-27T01:53:19.595Z Has data issue: false hasContentIssue false
  • English
  • Français

Point Defect Mechanisms in Deformation and Phase Transformation of Titanium Aluminide Alloys

Published online by Cambridge University Press:  11 February 2011

Fritz Appel ,
Jonathan D.H. Paul  and
Ulrich Fröbel
Fritz Appel
Affiliation:
Institute for Materials Research, GKSS-Research Centre Geesthacht, Max-Planck-Str. 1 D-21502 Geesthacht, Germany
Jonathan D.H. Paul
Affiliation:
Institute for Materials Research, GKSS-Research Centre Geesthacht, Max-Planck-Str. 1 D-21502 Geesthacht, Germany
Ulrich Fröbel
Affiliation:
Institute for Materials Research, GKSS-Research Centre Geesthacht, Max-Planck-Str. 1 D-21502 Geesthacht, Germany
Get access

Abstract

Point defects in intermetallic compounds are subjected to significant constraints due to the directional bonding, long-range order and off-stoichiometric deviation of the materials. This leads to a variety of defects with distinct differences in morphology, concentration and mobility. In the present study the implications of these defect characteristics on the mechanical properties of two-phase titanium aluminide alloys will be investigated. The major areas of the study are: (i) deformation induced point defects that contribute to work hardening; (ii) dislocation locking due to the formation of defect atmospheres; (iii) transport processes involved in phase transformation and recrystallization occurring during long-term creep. The applied methods include mechanical testing, static strain aging and structural characterisation by high resolution electron microscopy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB3.1
Copyright
Copyright © Materials Research Society 2003

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.)

References

REFERENCES

1. Brossmann, U., Würschum, R., Badura, K., Schäfer, H.-E., Phys. Rev. B 49, 6457 (1994).Google Scholar
2. Mishin, Y., Herzig, C., Acta Mater. 48, 589 (2000).Google Scholar
3. Shirai, Y., Yamaguchi, M., Mater. Sci. Eng. A 152, 173 (1992).Google Scholar
4. Yoo, M.H. and Fu, C.L., Metall. Mater. Trans. A, A 29, 49 (1998).Google Scholar
5. Schöck, G., Physica Status Solidi 8, 499 (1965).Google Scholar
6. Appel, F., Lorenz, U., Oehring, M., Sparka, U., Wagner, R., Mater. Sci. Eng. A, 233, 1(1997).Google Scholar
7. Appel, F., Wagner, R., Mater. Sci. Eng. R 22, 187 (1998).Google Scholar
8. Appel, F., Sparka, U., Wagner, R., Intermetallics 7, 325 (1999).Google Scholar
9. Paul, J.D.H. and Appel, F., Metall. Mater. Trans. A, in press.Google Scholar
10. Fröbel, U. and Appel, F., Acta Mater. 50, 3693 (2002).Google Scholar
11. Appel, F., Oehring, M., Wagner, R., Intermetallics 8, 1283 (2000).Google Scholar
12. Appel, F., Mater. Sci. Eng. A 317, 115 (2001).Google Scholar
13. Appel, F., Intermetallics 9, 907 (2001).Google Scholar
14. Appel, F., Christoph, U. and Oehring, M., Mater. Sci. Eng. A 329–331, 780 (2002).Google Scholar
15. Gilman, J.J. and Johnston, W.G., Solid State Phys. 13, 147 (1962).Google Scholar
16. Kroupa, F., Acta Metall. 14, 60 (1966).Google Scholar
17. Damask, A.C. and Dienes, G.J., “Point Defects in Metals”, (Gordon and Breach, 1963), New York.Google Scholar
18. Hirth, P.J., Lothe, J., Theory of dislocations, 2nd ed., (Krieger Publishing, 1992), Malabar.Google Scholar
19. Morris, M.A., Lipe, T., Morris, D.G., Scripta Mater., 34, 1337 (1996).Google Scholar
20. Christoph, U., Appel, F., Wagner, R., Mater. Sci. Eng. A 239–240, 39 (1997).Google Scholar
21. Kattner, U.R., Lin, J.C., Chang, Y.A., Metall. Trans. A, 23A, 2081 (1992).Google Scholar
22. Woodward, C., Kajihara, S.A., Rao, S.I., Dimiduk, D.M., “Gamma Titanium Aluminides 1999”, eds. Kim, Y-W., Dimiduk, D.M., Loretto, M.H., (TMS, 1999), Warrendale, PA, pp. 49–58.Google Scholar
23. Rossouw, C.J., Forwood, C.T., Gibbson, M.A., Miller, P.R., Phil. Mag. A 74, 77 (1996).Google Scholar
24. Inui, H., Oh, M.H., Nakamura, A., Yamaguchi, M., Phil. Mag. A 66, 539 (1992).Google Scholar