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Effects of the Variation in α-Phase Volume Fraction on the Thermal Stability of TiAl Alloys with Lamellar Microstructures

Published online by Cambridge University Press:  11 February 2011

S. W. Kim ,
H. N. Lee ,
M. H. Oh ,
M. Yamaguchi  and
D. M. Wee
S. W. Kim
Affiliation:
Department of Materials Science and Engineering, KAIST, Daejon 305–701, Korea Jointly Appointed at the Center for Advanced Aerospace Materials, POSTECH, Korea
H. N. Lee
Affiliation:
Department of Materials Science and Engineering, KAIST, Daejon 305–701, Korea Jointly Appointed at the Center for Advanced Aerospace Materials, POSTECH, Korea
M. H. Oh
Affiliation:
Department of Materials Science and Engineering, KIT, Gumi 730–701, Korea
M. Yamaguchi
Affiliation:
Department of Materials Science and Engineering, Kyoto Univ., Sakyo-ku, Kyoto 606–8501, Japan
D. M. Wee
Affiliation:
Department of Materials Science and Engineering, KAIST, Daejon 305–701, Korea Jointly Appointed at the Center for Advanced Aerospace Materials, POSTECH, Korea
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Abstract

The thermal stability of lamellar microstructure in Ti-Al-Mo PST crystals containing C or Si, was investigated. In addition, the variation of α-phase volume fraction in Ti-Al-Mo-(C,Si) systems was investigated at several temperatures. Ti-46Al-1.5Mo-0.2C and Ti-46Al-1.5Mo-1.0Si alloys were found to be very stable during heat treatments at various heating rates and temperatures. Moreover, the α-phase volume fractions of Ti-46Al-1.5Mo-0.2C and Ti-46Al-1.5Mo-1.0Si alloys, which were stable compositions, changed less than those of Ti-47Al and Ti-46–1.5Mo alloys, which were unstable compositions. From these results, it was determined that the instability of the latter alloys was caused by their relatively higher variation of α-phase volume fraction during heating. Therefore, it is suggested that the variation of α-phase volume fraction is an important factor in controlling the thermal stability of lamellar microstructure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB5.4
Copyright
Copyright © Materials Research Society 2003

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References

REFERENCES

1. Kim, Y-W., JOM, 46, 30 (1994)Google Scholar
2. Yamaguchi, M. and Inui, H., Structural Intermetallics, Darolia, R. et al.(Ed.), TMS, Champion, PA 127 (1993)Google Scholar
3. Kishida, K., Johnson, D. R., Masuda, Y., Umeda, H., Inui, H. and Yamaguchi, M., Intermetallics, 6, 679 (1998)Google Scholar
4. Lee, H. N., Johnson, D. R., Inui, H., Oh, M. H., Wee, D. M. and Yamaguchi, M., Acta Mater, 48, 3221 (2000)Google Scholar
5. Lee, H. N., Johnson, D. R., Inui, H., Oh, M. H., Wee, D. M. and Yamaguchi, M., Mater. Sci. Eng. A, 329–331C, 19 (2002)Google Scholar
6. Johnson, D. R., Inui, H. and Yamaguchi, M., Acta Mater., 44, 2523 (1996)Google Scholar
7. Johnson, D. R., Masuda, Y., Inui, H. and Yamaguchi, M., Acta Mater, 45, 2523 (1997)Google Scholar
8. Jung, I. S., Kim, M. C., Lee, J. H., Oh, M. H. and Wee, D. M., Intermetallics, 7, 1247 (1999)Google Scholar
9. Jung, I. S., Jang, H. S., Oh, M. H., Lee, J. H. and Wee, D. M., Mater. Sci. Eng. A, 329–331C, 13 (2002)Google Scholar
10. Johnson, D. R., Masuda, Y., Yamanaka, T., Inui, H. and Yamaguchi, M., Metall. Mater. Trans. A, 31A 2463 (2000)Google Scholar
11. Wang, J. N., Xie, K., Scr Metall, 43, 441 (2000)Google Scholar
12. Okamoto, H., J. Phase Equilibria, 14, 120 (1993)Google Scholar