X 線回折による溶融 Fe 及び Fe-C 合金の構造に関する研究

概要

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X-ray diffraction patterns were obtained for molten Fe, Co, and Ni and molten, Fe-C, Ni-C, and Fe-Si alloys at temperatures between melting point and 1650℃. After calculating the structure factor (Fourier analysis) the atomic radial distribution function was evaluated from which nearest neighbour distance r_1 and coordination number n_1 were obtained. Comparing the results with those previously observed by other investigators, a reasonable agreement was found. The dependence of the structure of molten Fe-C alloys on carbon concentration was found as follows ; the nearest neighbour distance r_1 and coordination number n_1 become larger with an increase in carbon concentration up to 2.1 wt% C. Between 2.1 wt% and 3.0 wt% C, r_1 and n_1 remain constant. Above 3.0 wt% C, r_1 and n_1 slightly decrease. On the other hand, r_1 and n_1 are almost constant in molten Ni-C alloys up to 2.0 wt% C. In molten Fe-Si alloys, r_1 and n_1 become smaller with an increase in silicon concentration up to 10.0 wt% Si. The structural behavior of molten alloys was discussed with reference to their crystal structures in the solid state.
社団法人日本鉄鋼協会の論文
1975-01-01