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Formation and Morphology of Kurnakov Type D022 Compound in Disordered fcc γ-(Ni, Fe) Matrix Alloys

Published online by Cambridge University Press:  26 February 2011

Akane Suzuki  and
Masao Takeyama
Akane Suzuki
Affiliation:
Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109, USA
Masao Takeyama
Affiliation:
Metallurgy and Ceramics Science, Tokyo Institute of Technology, Tokyo 152–8552, Japan
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Abstract

Formation and morphology of D022 compound Ni3V in γ-fcc alloys were investigated as a model case in order to understand fundamentals for microstructure control of new class of austenitic steels strengthened by Kurnakov-type GCP intermetallic compound. The formation process of the D022 phase in γ matrix varies, depending on the composition and heat treatment temperature, and precipitation of D022 takes place at temperature above T0 in the γ+D022 two phase region. The morphology of coherent precipitates of the D022 compound is sensitive to misfit strains against matrix and can be controlled by alloying addition. The habit planes between the two phases become irrational, parallel to both directions of the invariant line and an a-axis of D022, since the lattice misfit becomes negative along a-axis (δa) and positive along c-axis (δc) of the D022. The calculation based on the lattice invariant theory as well as experimental results clearly demonstrate that the misfit strain ratio δc/δa is a dominant factor to determine the habit plane. In addition, the shape of D022 phase, either prism or plate, depends strongly on the magnitude of |δa|. These findings will extend to Ni-Fe-Nb-V quaternary system, by partial replacement of Ni with Fe and that of V with Nb.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 842: Symposium S – Integrative and Interdisciplinary Aspects of Intermetallics , 2004 , S6.3
Copyright
Copyright © Materials Research Society 2005

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References

REFERENCES

1. Takeyama, M. in Integrates and Interdisciplinary Aspects of Intermetallics, edited by Mills, M.J. et al., (Mater. Res. Soc. Proc., Warrendale, PA, 2005) to be published.Google Scholar
2. Smith, J.F., Carlson, O.N. and Nash, P.G., Alloy Phase Diagrams 3(3), 342 (1982).Google Scholar
3. Suzuki, A., Takeyama, M. and Matsuo, T. in Defect Properties and Related Phenomena in Intermetallic Alloys, edited by George, E.P. et al., (Mater. Res. Soc. Proc. 753, Warrendale, PA, 2003) pp. 363–368.Google Scholar
4. Suzuki, A., Matsuo, T. and Takeyama, M. in Superalloys 2004, edited by Green, K.A. et al., (TMS, Warrendale, PA, 2004) pp. 115–124.Google Scholar
5. Suzuki, A., Doctoral Thesis (Tokyo Institute of Technology, Tokyo, Japan, 2003).Google Scholar
6. Suzuki, A., Kojima, H., Matsuo, T. and Takeyama, M., Intermetallics 12, 969 (2004).Google Scholar
7. Moreen, H.A., Taggart, R. and Polonis, D.H., Metall. Trans. 5, 79 (1974).Google Scholar
8. Kobayashi, S., Sumi, T., Koyama, T. and Miyazaki, T., J Japan Inst Metals 60, 22 (1996).Google Scholar
9. Soffa, W.A. and Laughlin, D.E., Acta Metall. 11, 3019 (1989).Google Scholar
10. Dahmen, U., Acta Metall. 30, 63 (1982).Google Scholar
11. Okihashi, M., Master Thesis (Tokyo Institute of Technology, Tokyo, Japan, 2002).Google Scholar
12. Oblak, J.M., Paulonis, D.F. and Duvall, D.S., Metall. Trans. 5, 143 (1974).Google Scholar
13. Zhao, J.-C. and Notis, M.R., Acta Mater. 46, 4203 (1998).Google Scholar