발간논문

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Vol.32, No.2, 214 ~ 224, 1994
Title
Ternary diffusion coefficients and Phase diagram in Fe - M - C systems
이병주 Byeong Joo Lee
Abstract
A model expression on the diffusion coefficients of multicomponent metallic alloys has been derived as a review of previous works by many-other researchers. A systematic method for evaluation of model parameters of multicomponent diffusion coefficients from experimental data reported in various form was suggested. From a thermodynamic consideration on the diffusion coefficient model, it was found that the off-diagonal diffusion coefficient of an interstitial element can be evaluated from phase diagram information on isopotential curve of that element resulting in the following relation. D_(CSi)/D_(cc)=-(dy_c/dy_(Si))_(μc) This relation has been applied on the Fe-Si-C ternary fcc alloys to evaluse D_(CSi) from known values of D_(cc) and experimentally reported isoactivity data of carbon. A computer simulation of well known Darken`s uphill diffusion in the fcc Fe-Si-C alloys has been carried out and it was concluded that the above relation can be used as an alternative way to evaluate the off-diagonal diffusion coefficients of interstitial elements when critically assessed thermodynamic data is not available.
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