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Electron Diffraction Study on the Crystal Structure of a Ternary Intermetallic Compound Co3AICx

Published online by Cambridge University Press:  10 February 2011

Yoshinao Mishima ,
Keurn-Yeon Hwang  and
Fu-Gao Wei
Yoshinao Mishima
Affiliation:
Department of Materials Science and Engineering, Tokyo Institute of Technology, Nagatsuta, Midoriku, Yokohama 226–8502, Japan.
Keurn-Yeon Hwang
Affiliation:
Graduate Student, Department of Materials Science and Engineering, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 226–8502, Japan.
Fu-Gao Wei
Affiliation:
On leave from Department of Materials Science and Engineering, Xi'an University of Technology, Xi'an, Shaanxi 710048, P.R.China.
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Abstract

Intermetallic compound Co3A1Cx, or called ic-phase, has been reported to assume the E21, or Perovskite structure. In the present work its crystal structure is critically reinvestigated in the two-phase alloys containing κ-phase in the Co primary solid solution matrix, α(Co), using conventional electron diffraction. It is shown that the crystal structure of κ-phase is a derivative of E21 being a cubic structure composed of eight E21 sub-unit cells in a half of which the body center sites are not occupied by carbon atoms. As a result, its space group is Fm3m and the chemical formula should be Co3AIC0.5. It is also found that the lattice parameter of the phase is about twice as large as that of α(Co). Orientation relationship of the κ-phase with the matrix α(Co) is found to be similar to the case for the γ' phase with the fcc γmatrix in a Ni-base superalloy since three orthogonal axes of κ-phase are parallel to those of α(Co). Lattice misfit under this orientation relationship between the two phases is found to be about 2.5%.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK7.8.1
Copyright
Copyright © Materials Research Society 1999

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References

REFERENCES

1. Huetter, L. J., Stadelmaier, H. H. and Fraker, A. C., Metall., 14,113(1960).Google Scholar
2. Grieb, B. and Stadelmaier, H. H., in Ternary Alloys vol.4, edited by Petzow, G. and Effenberg, G. (VCH Publishers, Weinheim, 1991), p.465.Google Scholar
3. Stadelmaier, H.H., in Developments in the Structural Chemistry of Alloy Phases, edited by Giessen, B.C.(Plenum Press, New York, 1969), p. 141.CrossRefGoogle Scholar
4. Nowotny, V.H., Angew. Chem., 84, 973(1972).CrossRefGoogle Scholar
5. Goldschmidt, H.J., J. Inst. Met., 97, 173(1969).Google Scholar
6. Jung, I. and Sauthoff, G., Z. Metallkde., 80, 490(1989).Google Scholar
7. Huang, S.C., Briant, C.L., Chang, K.-M., Taub, A.I. and Hall, E.L., J. Mater. Res., 1, 60(1986).CrossRefGoogle Scholar
8. Huetter, L.J. and Stadelmaier, H.H., Acta Metall., 6, 367(1958).CrossRefGoogle Scholar
9. Kaneko, T., Kanomata, T. and Shirakawa, K., J. Phys. Soc. Japan, 56, 4047(1987).CrossRefGoogle Scholar
10. Huetter, L.J. and Stadelmaier, H.H., Z. Metallkde.,50,199(1959).Google Scholar
11. Han, K.H. and Choo, W.K., Scr. Metall.,17,281(1983).CrossRefGoogle Scholar
12. Palm, M. and Inden, G., Intermetallics,3,443(1995).CrossRefGoogle Scholar
13. Schmid, E.E., in Ternary Alloys vol.3, edited by Petzow, G. and Effenberg, G. (VCH Publishers, Weinheim, 1991), p.519.Google Scholar
14. Tian, W.H., Sano, T. and Nemoto, M., Phil. Mag.,A68,965(1993).CrossRefGoogle Scholar
15. Cullity, B.D., Elements of X-ray Diffraction,2nd ed.(Addison Wesley, 1978).Google Scholar