Electron Diffraction Study on the Crystal Structure of a Ternary Intermetallic Compound Co<sub>3</sub>AIC<sub>x</sub>
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<jats:title>ABSTRACT</jats:title><jats:p>Intermetallic compound Co<jats:sub>3</jats:sub>A1C<jats:sub>x</jats:sub>, or called ic-phase, has been reported to assume the E2<jats:sub>1</jats:sub>, 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 E2<jats:sub>1</jats:sub> being a cubic structure composed of eight E2<jats:sub>1</jats:sub> 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 Co<jats:sub>3</jats:sub>AIC<jats:sub>0.5</jats:sub>. 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%.</jats:p>
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- MRS Proceedings
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MRS Proceedings 552 1998-01-01
Springer Science and Business Media LLC