Hostname: page-component-7479d7b7d-767nl Total loading time: 0 Render date: 2024-07-13T19:02:36.648Z Has data issue: false hasContentIssue false
  • English
  • Français

Microstructure of Extremely Fine Lamellae in a TiAl Base Alloy Studied by High-resolution Electron Microscopy

Published online by Cambridge University Press:  15 February 2011

E. Abe ,
T. Kumagai  and
M. Nakamura
E. Abe
Affiliation:
National Research Institute for Metals, Tsukuba-shi, Ibaraki 305, Japan
T. Kumagai
Affiliation:
National Research Institute for Metals, Tsukuba-shi, Ibaraki 305, Japan
M. Nakamura
Affiliation:
National Research Institute for Metals, Tsukuba-shi, Ibaraki 305, Japan
Get access

Abstract

An extremely fine lamellar structure formed in a Ti-48at.%Al alloy, which was heat treated in the high-temperature α-Ti (disordered hcp) single phase field (1683K), followed by ice water quenching, has been examined by high-resolution and analytical transmission electron microscopy. The microstracture consists of thin plates of ordered α2-Ti3Al (D019: ordered version of hcp) and γ-TiAl (Ll0: ordered version of fcc) phases, and interfaces of lamellae are atomically flat in a wide range. From detailed analyses of the microstructure and composition in nm scale, the α→γ phase transformation, which occurs during quenching and produces the extremely fine α2-γ lamellae, has been discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 400: Symposium E – Metastable Metal-Based Phases and Microstructures , 1995 , 281
Copyright
Copyright © Materials Research Society 1996

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

1. Huang, S.H. and Shih, D.S., in Microstructure / Property Relationships in Titanium Aluminides and Alloys, edited by Kim, Y.W. and Boyer, R.R. (TMS Proc, Warrendale, PA, 1991) pp. 91–103.Google Scholar
2. Takeyama, M., Kumagai, T., Nakamura, M. and Kikuchi, M., in Structural Intermetallics. edited by Darolia, R. et al. (TMS Proc., Warrendale, PA, 1993) pp. 167–176.Google Scholar
3. Wang, P., Viswanathan, G.B. and Vasudevan, V.K., Metall. Trans. A, 23A, 690 (1992).Google Scholar
4. Jones, S.A. and Kaufman, M.J., Acta metall. mater., 41, 387 (1993).Google Scholar
5. Kumagai, T., Abe, E., Takeyama, M. and Nakamura, M., in High-Temperature Ordered Intermetallic alloys VI. edited by Horton, J. A. et al. (MRS Proc. 364, Pittsburgh, PA, 1995) pp. 181–186.Google Scholar
6. Blackburn, M.J., in The Science, Technology and Applications of Titanium, edited by Jaffee, R. and Promisel, N.E. (Pergamon, Oxford), pp. 633–642.Google Scholar
7. Yang, Y.S., Wu, S.K. and Wang, J.Y., Phil. Mag. A, 67, 463, (1993).Google Scholar
8. Abe, E., Kumagai, T., Nakamura, M. and Hiraga, K., to be published.Google Scholar
9. Abe, E., Kumagai, T. and Nakamura, M., Phil. Mag. Lett., 72, 291 (1995).Google Scholar
10. Mahon, G.J. and Howe, J.M., Metall. Trans. A, 21A, 1655, (1990).Google Scholar
11. Singh, S.R. and Howe, J.M., Phil. Mag. A, 66, 739 (1992).Google Scholar
12. Yamaguchi, M. and Umakoshi, Y., Prog. in Mat. Sci., 34, (1992).Google Scholar
13. Inui, H., Oh, M.H., Nakamura, A. and Yamaguchi, M., Phil. Mag. A, 66, 539 (1992).Google Scholar
14. Hono, K., Abe, E., Kumagai, T. and Harada, H., Scripta Metall. Mater., submitted.Google Scholar
15. Abe, E. et al. , unpublished results (National Research Institute for Metals, 1995).Google Scholar
16. Abe, E., Kumagai, T. and Nakamura, M., Intermetallics, in press (1996).Google Scholar
17. McQuay, P.A., Dimiduk, D.M. and Semiatin, S.L., Scripta Metall. Mater., 25, 1689 (1991).Google Scholar
18. Yamabe, Y., Doctoral Thesis, Tokyo Institute of Technology, 1994.Google Scholar