Yoshinobu Tahara1, Kazutoshi Shinohara2, Hironori Kuroki3 and Tetsuo Eguchi2
1Miyakonojo Technical College, Miyakonojo
In FeCo alloy, the variation of lattice constant in isothermal annealing was observed by means of X-ray diffraction, and the experimental results were analyzed by the use of an approximate rate equation. This rate equation has been derived from the two conditions, namely, the symmetry between two sublattices in the B2 type structure, and the stability of the equilibrium state. The equation has an advantage over the others in that it is simpler and more general, but the physical meaning of the parameters used in this analysis is not clear. For this reason, the rate equation was compared with the one derived by Takagi and Oguchi the analogy to the chemical rate theory, and the activation energy for ordering in FeCo alloy was estimated to be 52.0 kcal/mol.
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