溶融 Fe-Cr および Fe-Cr-Ni 合金中の Cr の相互拡散

概要

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Interdiffusion coefficients of chromium in molten Fe-Cr and Fe-Cr-Ni alloys have been determined at 1550℃ by the diffusion couple method with the following results : (1) Interdiffusion coefficient in molten Fe-Cr alloy, D_<Fe-Cr>, is expressed by the following empirical equation for chromium content up to 15 at% : D_<Fe-Cr>×10^5=3.36-20.9N_<Cr>+171N^2_<Cr> cm^2/s (2) In molten Fe-Cr-Ni alloy with the composition of 4 at%Ni and 0 to 12 at%Cr, the main (diagonal) diffusion coefficient of chromium, D_<CrCr>, is 1.3 to 1.9 times as large as the binary diffusivity D_<Fe-Cr>, that is, an addition of nickel increases the diffusion rate of chromium. Cross diffusion coefficients, D_<CrNi> and D_<NiCr>, are estimated to be negative and smaller than the main coefficients by an order of magnitude.
社団法人日本鉄鋼協会の論文
1980-05-01