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Microstructural Studies of the Deformation of TiAl Alloys

Published online by Cambridge University Press:  26 February 2011

Ernest L. Hall  and
Shyh-Chin Huang
Ernest L. Hall
Affiliation:
GE Corporate Research and Development Center, PO Box 8, Schenectady, NY 12301
Shyh-Chin Huang
Affiliation:
GE Corporate Research and Development Center, PO Box 8, Schenectady, NY 12301
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Abstract

The mechanical behavior and microstructures of TiAl alloys after tensile and bend tests at room temperature and elevated temperatures were studied. The results for two-phase Ti52Al48 alloys are compared with those of single phase Ti48Al52, and the effect of adding 3 at. pct. vanadium as a substitute for Ti in these two alloys is considered. It is shown that Ti52Al48 has greater strength and ductility than Ti48Al52 at room temperature and elevated temperatures up to 871°C (1600°F). Adding vanadium increases the ductility of both binary alloys. The microstructure of the Ti52Al48 alloy deformed at room temperature contains primarily twins and 1/2<110> easy slip dislocations, whereas the similar Ti48Al52 sample exhibits superdislocations and associated pinned faulted dipoles. If these samples are deformed at 540°C (1000°F) or above, the Ti52Al48 exhibits extensive twinning, and the pinned faulted dipoles in the Ti48Al52 sample disappear. The vanadium additions do not noticeably change the deformation microstructure at room temperature. It is suggested that the strength and ductility of these alloys may be controlled by tetragonality, bonding, interstitial element, and grain size effects, which in turn are affected by the presence of second phases and by the alloy composition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 693
Copyright
Copyright © Materials Research Society 1989

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References

REFERENCES

1. Lipsitt, H. A., High Temperature Ordered Intermetallic Alloys, Materials Research Society Symposia Proceedings, Vol.39, Koch, C.C., Liu, C.T., and Stoloff, N.S., eds., (Materials Research Society, Pittsburgh, PA, 1985), pp. 351–364.Google Scholar
2. McAndrew, J. B. and Kessler, H. D., J. Metals, 8, 1348 (1956).Google Scholar
3. Ence, E. and Margolin, H., Trans. Metall. Soc. AIME, 221, 151 (1960).Google Scholar
4. Huang, S. C. and Hall, E. L., these proceedings.Google Scholar
5. Shechtman, D., Blackburn, M. J., and Lipsitt, H. A., Metall. Trans., 5, 1373 (1974).CrossRefGoogle Scholar
6. Lipsitt, H. A., Shechtman, D., and Schafrik, R.E., Metall. Trans. A, 6A, 1991 (1975).CrossRefGoogle Scholar
7. Hug, G., Loiseau, A., and Lasalmonie, A, Phil. Mag. A, 54, 47 (1986).CrossRefGoogle Scholar
8. Kawabata, T. and Izumi, O,Scripta Metall., 21, 433 (1987).CrossRefGoogle Scholar
9. Hug, G., Loiseau, A., and Veyssiere, P., Phil. Mag. A, 57, 499 (1988).CrossRefGoogle Scholar
10. Rowe, R. G. and Amato, R. A., Processing of Structural Materials by Rapid Solidification, Froes, F.H. and Savage, S. J.,, eds., (ASM, Metals Park, OH, 1987), pp. 251–260.Google Scholar
11. Hall, E. L. and Huang, S. C., accepted for publication, J. Mater. Res.Google Scholar
12. Huang, S. C., submitted to Scripta Metall.Google Scholar
13. Huang, S. C., Hall, E. L., and Gigliotti, M. F. X., High Temperature Ordered Intermetallic Alloys II, Materials Research Society Symposium Proceedings, Vol.81, N. S. Stoloff, C.C.Koch, C.T. Liu, and O. Izumi, eds., (Materials Research Society, Pittsburgh, PA, 1987), pp. 481–486.Google Scholar
14. Huang, S. C., Hall, E. L., and Gigliotti, M. F. X., Proc. Sixth World Conference on Titanium, Cannes, France, June 1988, in press.Google Scholar
15. Valencia, J. J., McCullough, C., Levi, C. G., and Mehrabian, R., Scripta Metall, 21, 1341 (1987).CrossRefGoogle Scholar
16. Graves, J. A., Bendersky, L. A., Biancaniello, F. S., Perepezko, J. H., and Boettinger, W. J., Mat.. Sci. and Eng., in press.Google Scholar
17. Jones, S. A., Shull, R. D., McAlister, A. J., and Kaufman, M. J., Scripta Metall., 22, 1235 (1988).CrossRefGoogle Scholar
18. Kawabata, T. and Izumi, O., Phil. Mag., 55, 823 (1987).CrossRefGoogle Scholar
19. Greenberg, B. A., phys. stat. sol., 42, 459 (1970).CrossRefGoogle Scholar
20. Huang, S. C. and Hall, E. L., unpublished research.Google Scholar