발간논문

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Vol.38, No.11, 1426 ~ 1432, 2000
Title
Characteristics of the Intermetallic Compound Co3AlCx ( k - phase ) in Co-Al-C System Part 2 : Crystal Structure of K-phase
황금연Keum Yeon Hwang , 강창석Chang Sug Kang , 명태호Tai Ho Myeong , Yoshinao Mishima
Abstract
The crystal structure of intermetallic compound Co₃AlC_x, κ-phase, is critically reinvestigated in the two phase alloys containing κ-phase in the Co primary solid solution matrix, α-Co, using conventional electron diffraction and convergent beam electron diffraction(CBED). Orientation relationship between κ-phase and α-Co and associated lattice misfit are also investigated. 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 half of which body center site is not occupied by carbon atom. Its space group is Fm3￣m and the chemical formula should be Co₃AlC_(0.5). Two types of anti-phase boundaries are predicted from the crystal structure of κ-phase and they are verified by experiment. Orient relationship between α-Co matrix and the κ-phase is found that three orthogonal axes of κ-phase are parallel to those of α-Co. Lattice misfit under this orientation relationship between the two phase is found to be about 2.5%.
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