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Temperature has great influence on the stacking fault energy (SFE). Both SFE and dr0/ d T for Fe-based alloys containing substitutional or interstitial atoms increase with increasing tempera-ture. Based on the thermodynamic model of SFE, the equation dr0/dT=drcn/dT+drseg/dT+drMG/dT and thoseexpressions for three items involved are established. The calculated dr0/dT is generally consistent with the experimental. The influence of chemical free energy on the temperature dependence of SFE is almost constant, and is obviously stronger than that of magnetic and segregation contributions. The magnetic transition and the segregation of alloying elements at stacking faults cause a decrease in SFE of the alloys when temperature increases; that is, drMG/dT<0 and dyseg/dT<0. Meanwhile, such an influence decreases with increasing temperature, except for the drseg/d 7 of Fe-Mn-Si alloys. With these results, the experimenal phenomena that the SFE of Fe-based alloys is not zero at the thermo-dynamically equilibrated tem
Both SFE and dr0 / dTfor Fe-based alloys containing substitutional or interstitial atoms increase with increasing temperaure. Based on the thermodynamic model of SFE, the equation dr0 / dT = drcn / dT + drseg / dT + drMG / dT and thoseexpressions for three items involved. The calculated dr0 / dT is generally consistent with the experimental. The influence of chemical free energy on the temperature dependence of SFE is almost constant, and the magnetic transition and the segregation of alloying elements at stacking faults cause a decrease in SFE of the alloys when temperature increases; that is, drMG / dT <0 and dyseg / dT <0. Meanwhile, such an influence decreases with increasing temperature, except for the drseg / d 7 of Fe-Mn-Si alloys. With these results, the experimenal phenomena that the SFE of Fe-based alloys is not zero at the thermo-dynamical ly equilibrated tem