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High Temperature Deformation of a Nb-Ti-Al Alloy With σ+γ Microstructure

Published online by Cambridge University Press:  22 February 2011

Fereshteh Ebrahimi  and
Bernardo J. G. DeAragao
Fereshteh Ebrahimi
Affiliation:
Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611
Bernardo J. G. DeAragao
Affiliation:
CpqD-Telebras, Campinas, Brazil
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Abstract

An alloy with composition 27Nb-33Ti-40Al (at. %) was heat treated to produce a fine two-phase microstructure of σ (Nb2Al) and γ (TiAl) phases. This microstructure exhibited a peak in the flow curves obtained in the strain rate range 5 × 10−4 to 5 × 10−6s−1 at 1000°C, with a stress exponent of 3. The deformation occurred by dislocation activity and twinning accompanied by dynamic recrystallization of the γ-phase and extensive grain boundary sliding of the σ-phase, which resulted in the separation and fragmentation of the latter phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 1247
Copyright
Copyright © Materials Research Society 1995

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References

1. Yamaguchi, M. and Inui, H., in Structural Intermetallics, edited by Darolia, R. et al., Proceedings of the First Intl. Symp. on Structural Intermetallics (TMS Publication, Warrendale, PA, 1993) p. 127.Google Scholar
2. Banerjee, D., Rowe, R.G., and Hall, E.L., Mat. Res. Soc. Symp. Proc. 213 (1991) p. 285.Google Scholar
3. Hoelzer, D.T. and Ebrahimi, F., in High Temperature Niobium Alloys, edited by Stephens, J.J. and Ahmad, I. (The Metallurgical Society of AIME, Warrendale, PA, 1991) pp. 104–119.Google Scholar
4. Hoelzer, D.T. and Ebrahimi, F., Mater. Res. Soc. Symp. Proc. 194 (1990) pp. 393–398.Google Scholar
5. Ebrahimi, F. and Castillo, J.R., Acta Metall. Mater. 40, 1409–1416 (1992).Google Scholar
6. Ebrahimi, F., Hoelzer, D.T., and Castillo-Gomez, J.R., Mater. Sci. Eng. A171, 35–45 (1993).Google Scholar
7. Imayev, R.M., Kaibyshev, O.A., and Salischchev, G.A., Acta Metall. Mater. 40 (3), 581 (1992).Google Scholar
8. Cheng, S.C., Wolfenstine, J., and Sherby, O.D., Metall. Trans. 23A, 1509 (1992).Google Scholar
9. Luton, M.J. and Sellars, C.M., Acta Metall. 17, 1033 (1969).Google Scholar