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Formation and morphology of Kurnakov type D022 compound in disordered face-centered cubic γ–(Ni, Fe) matrix alloys

Published online by Cambridge University Press:  01 January 2006

Akane Suzuki  and
Masao Takeyama
Akane Suzuki*
Affiliation:
Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109
Masao Takeyama
Affiliation:
Metallurgy and Ceramics Science, Tokyo Institute of Technology, Tokyo 152-8552, Japan
*
a)Address all correspondence to this author. e-mail: akanes@engin.umich.edu This paper was selected as the Outstanding Meeting Paper for the 2004 MRS Fall Meeting Symposium S Proceedings Vol. 842.
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Abstract

Formation and morphology of D022 compound Ni3V in γ face-centered cubic (fcc) matrix phase were investigated to understand fundamentals for controlling microstructure of alloys strengthened by Kurnakov-type geometrically close-packed (GCP) intermetallics. The D022 phase with plate-shaped morphology coherently precipitates in the γ + D022 two-phase region above the T0 line in Ni–V binary alloys. Due to the negative and positive lattice misfits along the a-axis and the c-axis of D022 (δa < 0 < δc), an invariant line exists between the two phases, and the morphology of D022 phase is changeable by controlling the two factors; the misfit strain ratio δc/δa is a decisive factor to determine the habit plane defined by the invariant line and one of the a-axes of D022, whereas the magnitude of |δa| is responsible for the shape of D022 phase with either prism or plate. These findings were extended to Ni–Fe–Nb–V system by partial replacement of Ni and V with Fe and Nb, respectively.

Keywords

Intermetallic alloysMorphologyPhase transformation

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Type
Outstanding Meeting Papers: Articles
Information
Journal of Materials Research , Volume 21 , Issue 1 , January 2006 , pp. 21 - 26
Copyright
Copyright © Materials Research Society 2006

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References

REFERENCES

1.Smith, J.F. and Carlson, O.N.: The Ni–V (nickel-vanadium) system. Bull. Alloy Phase Diagrams 3, 342 (1982).CrossRefGoogle Scholar
2.Takeyama, M.: Design of austenitic heat-resistant steels strengthened by intermetallic compounds. Report of JSPS 123rd Committee on Heat-Resisting Materials and Alloys. 45, 51 (2004).Google Scholar
3.Takeyama, M., Gomi, N., Morita, S. and Matsuo, T. Phase equilibria and lattice parameters of Fe2Nb Laves phase in Fe–Ni–Nb ternary system at elevated temperatures, in Integrative and Interdisciplinary Aspects of Intermetallics, edited by Mills, M.J., Inui, H., Clemens, H., and Fu, C-L. (Mater. Res. Soc. Symp. Proc. 842, Warrendale, PA, 2005), p. 461.Google Scholar
4.Suzuki, A., Takeyama, M. and Matsuo, T. A1→ D022 transformation and multi-variant structure of Ni3V, in Defect Properties and Related Phenomena in Intermetallic Alloys, edited by George, E.P., Inui, H., Mills, M.J., and Eggeler, G. (Mater. Res. Soc. Symp. Proc. 753 Warrendale, PA, 2003), p. 363.Google Scholar
5.Suzuki, A., Kojima, H., Matsuo, T. and Takeyama, M.: Alloying effect on stability of multi-variant structure of Ni3V at elevated temperatures. Intermetallics 12, 969 (2004).CrossRefGoogle Scholar
6.Suzuki, A. and Takeyama, M. Phase transformations of A1→D022 in Ni–V binary alloys, in Solid-Solid Phase Transformations in Inorganic Materials, edited by Howe, J.M., Laughlin, D.E., Lee, J.K., Srolovitz, D.J., and Dahmen, U., (TMS, Warrendale, PA, 2005 , in press).Google Scholar
7.Suzuki, A., Matsuo, T. and Takeyama, M. Microstructure control of Ni base alloys with high volume fraction of D022 compound, in Superalloys 2004, edited by Green, K.A., Pollock, T.M., Harada, H., Howson, T.E., Reed, R.C., Schirra, J.J., and Walston, S. (TMS, Warrendale, PA, 2004), p. 115.Google Scholar
8.Suzuki, A. Microstructure evolution and morphology of D022 compound in Ni base alloys. Doctoral Thesis, Tokyo Institute of Technology, Tokyo, Japan, 2003.Google Scholar
9.Moreen, H.A., Taggart, R. and Polonis, D.H.: The formation of modulated structures in Ni–V alloys. Metall. Trans. 5, 79 (1974).CrossRefGoogle Scholar
10.Kobayashi, S., Sumi, T., Koyama, T. and Miyazaki, T.: Determination of coherent phase boundaries in Ni–V and Ni–Mo alloys by utilizing macroscopic composition gradient. J. Jpn. Inst. Metals 60, 22 (1996).CrossRefGoogle Scholar
11.Soffa, W.A. and Laughlin, D.E.: Decomposition and ordering process involving thermodynamically first-order order → disorder transformations. Acta Metall. 37, 3019 (1989).Google Scholar
12.Dahmen, U.: Orientation relationship in precipitation systems. Acta Metall. 30, 63 (1982).CrossRefGoogle Scholar
13.Okihashi, M. Alloying effect on the crystal structure of Ni3V–γ″. Master Thesis, Tokyo Institute of Technology, Tokyo, Japan, 2002.Google Scholar
14.Oblak, J.M., Paulonis, D.F. and Duvall, D.S.: Coherency strengthening in Ni-base alloys hardened by D022–γ″ precipitates. Metall. Trans. 5, 143 (1974).Google Scholar
15.Zhao, J-C. and Notis, M.R.: Spinodal decomposition, ordering transformation, and discontinuous precipitation in a Cu–15Ni–8Sn alloy. Acta Mater. 46, 4203 (1998).CrossRefGoogle Scholar