Hostname: page-component-78c5997874-lj6df Total loading time: 0 Render date: 2024-11-18T21:55:17.584Z Has data issue: false hasContentIssue false
  • English
  • Français

Effect of Planar Fault Energies on Dislocation Core Structures and Mobilities in L10 Compounds

Published online by Cambridge University Press:  01 January 1992

J.P. Simmons ,
S.I. Rao  and
D.M. Dimiduk
J.P. Simmons
Affiliation:
NRC Research Associate, Wright Laboratory, WL/MLLM, Wright-Patterson AFB, OH 45433
S.I. Rao
Affiliation:
Universal Energy Systems, Inc., Dayton, OH 45432
D.M. Dimiduk
Affiliation:
Wright Laboratory, WL/MLLM, Wright-Patterson AFB, OH 45433
Get access

Abstract

A set of three Embedded Atom Method potentials are presented that produce a stable L1 0structure. All three were nominally fitted to experimental parameters of the γ-TiAl phase; variations in the fit were allowed in order to give potentials with differing values of planar fault energies. These potentials were evaluated and found to produce stable APB(111), APB(100), CSF(111), and SISF(111) faults. Dislocation core structures were computed for 1/2<110>-type dislocations in both edge and screw orientation with all three potentials. The screw orientation of the highest fault energy potential was found to have a non-planar configuration, being spread about equally on two {111} close packed planes. All other cores were found to be planar and spread on a single {111} plane. No significant edge components of strain developed for the screw orientation, suggesting that these dislocations would not appear to be spread in Atomic Resolution TEM. Preliminary evaluations showed that dislocation mobilities were low, requiring stresses on the order of 10-3 μ for motion.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 335
Copyright
Copyright © Materials Research Society 1995

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Kim, Y.W.. Mater. Res. Soc. Symp. Proc. 213, 777, (1991).Google Scholar
2. Kim, Y.W. and Dimiduk, D.M., J. of Metals, 43(8), 40, (1991).Google Scholar
3. Kim, Y.W.. J. of Metals, 41(7), 24, (1989).Google Scholar
4. Fleischer, R.L., Dimiduk, D.M., and Lipsitt, H.A., Annual Reviews in materials Science 19, 231, (1989).Google Scholar
5. Court, S.A., Vasudevan, V.K., and Fraser, H.L., Phil. Mag., 61, 141, (1990).Google Scholar
6. Vitek, V., Crystal Lattice Defects 5, 1,(1974).Google Scholar
7. Vitek, V., in Dislocations and Properties of Real Materials. Proceedings of the Conference to Celebrate the Fiftieth Anniversary of the Concept of Dislocations in Crystals, (The Institute of Metals, London, 1985), p. 30.Google Scholar
8. Duesbery, M.S., in Dislocations in Solids, vol. 8. edited by Nabarro, F.R.N. (North-Holland, NY, 1989). p. 67.Google Scholar
9. Grinberg, B.A., Antonova, O.V., Indenbaum, V.N., Karkina, L.E., Notkin, A.B., and Ponomarev, M.V., Dislocations in TiAI-Part I. Institute of Metals Physics, Ural Division of the USSR Academy of Science, 3, (1989).Google Scholar
10. Grinberg, B. A., Ivanov, M.A., Gornostyrev, Yu. N., and Yakovenko, L.I., Phys. Met. Metall., 39, 117, (1978).Google Scholar
11. Daw, M.S. and Baskes, M.I., Phys. Rev. Lett. 50(17), 1285. (1983).Google Scholar
12. Pasianot, R., Farkas, D., and Savino, E.J., de Physique, J., special issue, ‘Mechanisms of Deformation and Strength of Advanced Materials,’ (1990).Google Scholar
13. Foiles, S.M. and Daw, M.S., J. Mater. Res. 2, 5, (1987).Google Scholar
14. Voter, A.F. and Chen, S.P., Mater, Res. Soc. Symp. Proc. 82, 175, (1990).Google Scholar
15. Parthasarathy, T.A., Dimiduk, D.M., Woodward, C., and Diller, D.. Mater. Res. Soc. Symp. Proc. 213, 337, (1991).Google Scholar
16. Parthasarathy, T.A., Rao, S.I., Dimiduk, D.M., accepted for publication in Phil. Mag. Google Scholar
17. Rao, S.I.. Woodward, C., and Parthasarathy, T.A., Mater. Res. Soc. Symp. Proc. 213, 125, (1991).Google Scholar
18. Yamaguchi, M., Vitek, V., and Pope, D.P.. Phil. Mag. A 43(4). 1027, (1981).Google Scholar
19. Yamaguchi, M., Paidar, V., Pope, D.P., and Vitek, V., Phil. Mag. A 45(5), 867, (1982).Google Scholar
20. Rose, J.H., Smith, J.R., Guinea, F., and Ferrante, J., Phys. Rev. B 29, 2963, (1984).Google Scholar
21. Takeuchi, S., Phil. Mag. A, 41(4). 541, (1980).Google Scholar
22. Woodward, C., McLauren, J., and Rao, S.I., J. Mater. Res. 7, 1735, (1992).Google Scholar
23. Fu, C.L. and Yoo, M., Mater. Res. Soc. Symp. Proc, 186, 265, (1990).Google Scholar
24. Hug, G., Ph.D. Dissertation (1988), University of Orsay (France).Google Scholar
25. Yamaguchi, M., Umakoshi, Y., and Yamane, T., Dislocations in Solids. 77, (1985).Google Scholar
26. Hirth, J.P. and Lothe, J., Theory of Dislocations. (McGraw-Hill, HY, 1968), p. 298.Google Scholar
27. Nye, J. F.. Physical Properties of Crystals. (Oxford University Press. London, 1957), p. 142.Google Scholar
28. Hug, G., Loiseau, A., and Lasalmonie, A.. Phil. Mag. A54, 47. (1986).Google Scholar
29. Hug, G., Loiseau, A., and Veyssiere, P., Philos. Mag. A57, 499, (1988).Google Scholar
30. Schechtman, D., Blackburn, M.J., and Lipsitt, H.A.. Metall. Trans. 5. 1373. (1974).Google Scholar
31. Hemker, K.J., Viguier, V., and Mills, M.J., in press.Google Scholar