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Incommensurate Structure in Al-rich TiAl Alloys

Published online by Cambridge University Press:  21 March 2011

S. Wang ,
D. Fort ,
I. P. Jones  and
J. S. Abell
S. Wang
Affiliation:
School of Metallurgy and Materials, The University of Birmingham, Birmingham, B15 2TT, England
D. Fort
Affiliation:
School of Metallurgy and Materials, The University of Birmingham, Birmingham, B15 2TT, England
I. P. Jones
Affiliation:
School of Metallurgy and Materials, The University of Birmingham, Birmingham, B15 2TT, England
J. S. Abell
Affiliation:
School of Metallurgy and Materials, The University of Birmingham, Birmingham, B15 2TT, England
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Abstract

The microstructures of Ti-Al alloys in the range 56–62 at.% Al have been studied. These compounds consist of a basic L10 structure on which is superimposed an irrational modulation (Ti3Al5 related). This is incommensurate by occupation. It has two-dimensional modulations in which the wave vectors are q1 = α(a* + b*) and q2 = α(-a* + b*) where a* and b* are the L10 reciprocal basis and α is an irrational fraction. α decreases from 0.282 to 0.26 as the Al concentration increases to 60 at.% Al, i.e., the positions of the satellites change continuously with varying Al concentration. A third phase, TiAl2, appears at a composition of 62 at.% Al which means that no Ti3Al5 (62.5 at.% Al) of stoichiometric composition can ever exist.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N5.43.1
Copyright
Copyright © Materials Research Society 2001

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Footnotes

1

Also IRC in Materials for High Performance Applications, The University of Birmingham, B15 2TT, England

References

REFERENCES

1. Miida, R., Hashimoto, S. and Watanabe, D., Japanese J. Appl. Phy., 21, L59 (1982).Google Scholar
2. Nakano, T., Matsumoto, K., Seno, T., Oma, K. and Umakoshi, Y., Phil. Mag. A, 74, 251 (1996).Google Scholar
3. Nakano, T., Hagihara, K., Seno, T., Sumida, N., Yamaoto, M. and Umakoshi, Y., Phil. Mag. Lett., 78, 385 (1998).Google Scholar
4. Loiseau, A. and Lasalmonie, A., Acta Cryst., B39, 580 (1983).Google Scholar
5. Loiseau, A., Lasalmonie, A., Van Tendeloo, G., Van Landuyt, J. and Amelincks, S., Acta Cryst., B41, 411 (1985).10.1107/S0108768185002385Google Scholar
6. Inui, H., Chikugo, K., Kishida, K. and Yamaguchi, M., ICEM 14, Cancun, Mexico, p 175 (1998).Google Scholar
7. Janssen, T., Janner, A., Looijenga-Vos, A. and de Wolff, P. M., International Table for Crystallography, Vol. C, Chaper 9.8. (1995).Google Scholar
8. Inui, H., Matsumuro, M., Wu, D. H. and Yamaguchi, M., Phil. Mag. A, 75, 395 (1997).Google Scholar
9. Sauvage, M. and Parthé, E., Acta Cryst., A28, 607 (1972).Google Scholar
10. De Wolff, P. M., Acta Cryst., A40, 34 (1984).Google Scholar
11. Chung, C. Y., Zou, W. H., Han, X. D., Lam, C. W. H., Gao, M., Duan, X. F. and Lai, J. K. L., Acta Mater., 46, 5541 (1998).Google Scholar