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Atomistic Modeling of Interfacial Diffusion in the Lamellar Li0 TiAl

Published online by Cambridge University Press:  15 February 2011

M. Nomura ,
D. E. Luzzi  and
V. Vitek
M. Nomura
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania, 19104-6272
D. E. Luzzi
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania, 19104-6272
V. Vitek
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania, 19104-6272
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Abstract

Atomistic simulation employing many-body central-force potentials was performed to elucidate the diffusion mechanisms in the bulk and at lamellar interfaces assuming a vacancy mechanism. First the self- diffusion of Ti and Al in stoichiometric structures was studied. It was found that the diffusion was faster along lamellar interfaces than in the bulk; the effective activation energy for the diffusion coefficient is about ∼15% lower. The simulations were then extended to investigate diffusion along lamellar boundaries with segregated Ti which is likely in Ti rich alloys. The surprising result is that diffusion remains practically unchanged when compared with the stoichiometric case. The reason is that while the path controlling the diffusion is different, the corresponding effective formation and migration energies are practically the same as in the stoichiometric case.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 578: Symposia A/C – Multiscale Phenomena in Materials - Experiments in Modeling , 1999 , 401
Copyright
Copyright © Materials Research Society 2000

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References

REFERENCES

1. Liu, C.T., Cahn, R.W., and Sauthoff, G., editors, Ordered Intermetallics - Physical Metallurgy and Mechanical Behaviour (Kluwer Academic Publishers, Dodrecht, 1992).Google Scholar
2. Baker, R. Darolia, Whitten, J.D., and Yoo, M. H., editors, High-Temperature Ordered Intermetallic Alloys V, (Materials Research Society, Pittsburgh, 1993), Vol. 288.Google Scholar
3. Darolia, R., J. J., , Lewandowski, , Liu, D. T., Martin, P.L., Miracle, D.B., Nathal, M. V.., editors, Structural Intermetallics, (TMS, Warrendale, 1993).Google Scholar
4. Liu, C. T., Wang, S. H., and Pope, D. P., editors, Proc. 3rd Int. Conf on High Temperature Intermetallics, Mat. Sci. and Eng. A 192/193 (1995).Google Scholar
5. Horton, J., Hanada, S., Baker, I., Noebe, R.D. and Schwartz, D., editors, High-Temperature Ordered Intermetallic Alloys VI, (Materials Research Society, Pittsburgh, 1995), Vol. 364.Google Scholar
6. Westbrook, J. H. and Fleischer, R. L., editors, Intermetallic Compounds-Principles and Practice, (John Wiley & Sons, New York, 1995).Google Scholar
7. Yamaguchi, M., Inui, H., Yokoshima, S., Kishida, K. and Johnson, D. R., Mat. Sci. and Eng. A 213, 25 (1996).Google Scholar
8. Stoloff, S. and Sikka, V. K., editors, Physical Metallurgy and Processing of Intermetallic Compounds, (Chapman & Hall, New York, 1996).Google Scholar
9. Yamaguchi, M., Inui, H., Kishida, K., Matsumoro, M. and Shirai, Y., in High-Temperature Ordered Intermetallic Alloys VI, edited by Horton, J., Baker, I., Hanada, S., Noebe, R. D. and Schwartz, D. (Materials Research Society, Pittsburgh), Vol. 364, p. 3 (1995).Google Scholar
10. Schwartz, D. S. and Sastry, S. M. L., Scripta Metall. 23, 1621 (1989).Google Scholar
11. Inui, H., Oh, M. H., Nakamura, A. and Yamaguchi, M., Philos. Mag. A 66, 539 (1992).Google Scholar
12. Herzig, C., Przeorski, T. and Mishin, Y., Intermetallics 7, 389 (1999).Google Scholar
13. Mishin, Y. and Herzig, C., Mat. Sci. and Eng. A 260, 55 (1999).Google Scholar
14. Herzig, C. and Mishin, Y., Acta Mater., to be published, (2000).Google Scholar
15. McCullough, C., Valencia, J. J., Mateous, H., Levi, C. G., Mehrabian, R. and Rhyne, K. A., Scripta Metall. 22, 1131 (1988).Google Scholar
16. Inui, H., Kishida, K., Kobayashi, M., Yamaguchi, M., Kawasaki, M. and Ibe, K., Philos. Mag. A 74, 451 (1996).Google Scholar
17. Ito, K. and Vitek, V., Acta Mater. 46, 5435 (1998).Google Scholar
18. Girschick, A. and Vitek, V., in High-Temperature Ordered Intermetallic Alloys VI, edited by Horton, J., Baker, I., Hanada, S., Noebe, R. D. and Schwartz, D. (Materials Research Society, Pittsburgh), Vol. 364, p. 145 (1995).Google Scholar
19. Vitek, V., Girshick, A., Siegl, R., Inui, H. and Yamaguchi, M., in Properties of Complex Inorganic Solids, edited by Gonis, A., Turchi, P. and Meike, A. (New York, Plenum Press), p. 355 (1997).Google Scholar
20. Hagen, M. and Finnis, M. W., Philos. Mag. A 77, 447 (1998).Google Scholar