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Viscosity evaluation of Fe–Ni–Co ternary alloy from the measured binary systems
Yanhui Liu,Xuewei Lv,Chenguang Bai,Pingsheng Lai,JinSheng Wang 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.30 No.-
The iso-viscosity curves of liquid Fe–Ni–Co ternary alloys at 1600 8C were investigated with consideringthe excess viscosity of ternary alloy by the means of three models (Kohler, Toop and Chou) from themeasured sub-binary data in this work. Excess viscosities were used instead of excess thermodynamicproperties in geometrical models, and the excess viscosities of the sub-binary systems were fit by usingthe 3rd degree (n = 3) Redlich–Kister polynomial. The increase of Ni content results in the decrease of theviscosity of the ternary alloy, while Fe has opposite effect. When the molar content of Ni within the alloydoes not exceed 50%, the increase of Co lowers the viscosity. Once its content is above 50%, Co canpromote the increase of the viscosity of the ternary alloy. Similarity coefficients of the Fe–Ni, Fe–Co andNi–Co three binary systems mentioned in the Chou model have been calculated and their values are 0.82,0.20 and 0.47, respectively, showing that the Fe–Ni–Co ternary system is not exactly the ‘‘Kohler model’’or ‘‘Toop model’’, so both Kohler model and Toop model cannot obtain the accurate predicted values. Thepredicted iso-viscosity curves calculated by the Chou model should be recommended. Some activationenergies of the ternary alloy were calculated by the three models and compared with three sub-binarysystems, and the evaluated activation energies calculated by the Chou model should be recommended. Except the sample AE3 and AE6, other activation energy values predicted by three different models aresimilar by a narrow margin. The activation energies for AE3 and AE6 are the lowest and highest,respectively, because of the mix effect of the ternary alloy.
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