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Interactions of Dislocations and Deformation Twins with Interfacial Boundaries in Titanium Aluminides

Published online by Cambridge University Press:  21 February 2011

Fritz Appel  and
Richard Wagner
Fritz Appel
Affiliation:
Institute for Materials Research, GKSS Research Centre, Max-Planck-Str., D-21502 Geesthacht, Germany
Richard Wagner
Affiliation:
Institute for Materials Research, GKSS Research Centre, Max-Planck-Str., D-21502 Geesthacht, Germany
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Abstract

The deformation behaviour of two-phase titanium aluminide alloys with a lamellar microstructure of the intermetallic phases α2(Ti3Al) and y(TiAl) was studied. The interaction processes of dislocations and deformation twins, respectively, with the lamellar interfaces are investigated by conventional and high-resolution electron microscopy. The mechanisms of translation of shear deformation across, the lamellar boundaries depend on their structure. Semicoherent interfaces are very effective barriers limiting the propagation of shear deformation. The misfit dislocations present at these interfaces support, on the other hand, the generation of dislocations and deformation twins. The observed processes are discussed regarding plastic deformation and crack propagation in the material.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 319: Symposia CB – Defect-Interface Interactions , 1993 , 279
Copyright
Copyright © Materials Research Society 1994

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References

[1] Kim, Y.-W. and Dimiduk, D.M., JOM 43,40 (1991)Google Scholar
[2] Huang, S.C. and Hall, E.L., Metall. Trans. 22A, 427 (1991)CrossRefGoogle Scholar
[3] Beaven, P.A., Appel, F., and Dogan, B. in Ordered Intermetallics - Physical Metallurgy and Mechanical Behaviour, edited by Liu, C.T., Cahn, R. W. and Sauthoff, G., (NATO ASI Series E: Applied Sciences, Kluwer Academic Publisher, Dodrecht, 1991) p. 413 Google Scholar
[4] Yamaguchi, M. and Inui, H. in Structural Intermetallics. edited by Darolia, R., Levandowski, J.J., Liu, C.t., Martin, P.L., Micracle, D.B., and Natkal, M.V., (TMS, Warrendale, PA, 1993), p. 127 Google Scholar
[5] Blackburn, M.J. in Technology and Application of Titanium, edited by Jaffee, R.T. and Promisel, N.E. (Pergamon, London, 1970), p. 633 Google Scholar
[6] Kim, Y. W. and Froes, F.H. in High-Temperature Aluminides and Intermetallics. edited by Whang, S.H., Liu, C.t., Pope, D., and Stiegler, J.O., (TMS, Warrendale, PA, 1990) p. 465 Google Scholar
[7] Sastry, S.L.M. and Lipsitt, H.A., Metall. Trans., 8A, 299 (1977)Google Scholar
[8] Inui, H., Oh, M.H., Nakamura, A., and Yamaguchi, M., Phil. Mag. A, 66, 539, (1992)Google Scholar
[9] Shechtman, D., Blackburn, M.J. and Lipsitt, H.A., Metall. Trans. 5, 1373, (1974)Google Scholar
[10] Lipsitt, H.A., Shechtman, D. and Schafrik, R.E., Metall. Trans. 6A, 1991, (1975)CrossRefGoogle Scholar
[11] Yamaguchi, M. and Umakoshi, Y., Progress in Materials Science 34, 1 (1990)Google Scholar
[12] Fujiwara, T., Nakamura, A., Hosomi, M, Nishitani, S.R., Shirai, Y., and Yamaguchi, M., Phil. Mag. A 61, 591 (1990)Google Scholar
[13] Appel, F., Beaven, P.A. and Wagner, R., Acta metall. Mater. 41, 1721 (1993)Google Scholar
[14] Vasudevan, V.K., Stucke, M.A., Court, S.A., and Fraser, H.L., Phil. mag. lett. 59, 299 (1989)Google Scholar
[15] Chan, K.S. and Kim, Y.-W., Metall. Trans. 23A, 1663 (1992)Google Scholar
[16] Inui, H., Nakamura, A., Oh, M.H., and Yamaguchi, M., Phil Mag. A 66, 557 (1992)Google Scholar
[17] Morris, M.A., Phil. Mag. A 68, 259 (1993)Google Scholar
[18] Appel, F., Christoph, U. and Wagner, R., The Structure and Stress State of Lamellar Interfaces in Two-Phase Titanium Aluminides, presented at the 1993 MRS Fall Meeting, Boston, Symposium Ca: (to be published)Google Scholar
[19] Appel, F. and Wagner, R., Slip-Twin Interactions in γ-Titanium Aluminides, Proceedings of TMS Symposium on “Twinning in Advanced Materials, 1993 Materials Week, Pittsburgh, PA, October 18-20, 1993, TMS Special Publication, Warrendale, PA, 1994.Google Scholar
[20] Kim, Y.-W. in Aspects of High Temperture Deformation and Fracture in Crystalline Materials, edited by Hosoi, Y., Yoshinaga, H., Oikawa, H., and Maruyama, K., (The Japan Institute of Metals, Sendai, 1993), p. 373.Google Scholar