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Viscosity evaluation of Fe-Ni-Co ternary alloy from the measured binary systems

机译：根据测量的二元体系评估Fe-Ni-Co三元合金的粘度

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The iso-viscosity curves of liquid Fe-Ni-Co ternary alloys at 1600 degrees C were investigated with considering the excess viscosity of ternary alloy by the means of three models (Kohler, Toop and Chou) from the measured sub-binary data in this work. Excess viscosities were used instead of excess thermodynamic properties in geometrical models, and the excess viscosities of the sub-binary systems were fit by using the 3rd degree (n = 3) Redlich-Kister polynomial. The increase of Ni content results in the decrease of the viscosity of the ternary alloy, while Fe has opposite effect. When the molar content of Ni within the alloy does not exceed 50%, the increase of Co lowers the viscosity. Once its content is above 50%, Co can promote the increase of the viscosity of the ternary alloy. Similarity coefficients of the Fe-Ni, Fe-Co and Ni-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. The predicted iso-viscosity curves calculated by the Chou model should be recommended. Some activation energies of the ternary alloy were calculated by the three models and compared with three sub-binary systems, 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 are similar 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. (C) 2015 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
机译：利用三种模型（Kohler，Toop和Chou），从测量的二元数据中，考虑了三元合金的过剩粘度，研究了液态Fe-Ni-Co三元合金在1600℃时的等粘度曲线。工作。在几何模型中，使用了过多的粘度来代替过剩的热力学性质，并且使用三阶（n = 3）Redlich-Kister多项式拟合了子二元系统的过剩粘度。 Ni含量的增加导致三元合金的粘度降低，而Fe具有相反的作用。当合金中Ni的摩尔含量不超过50％时，Co的增加降低了粘度。一旦其含量高于50％，Co可促进三元合金粘度的增加。计算了Chou模型中提到的F​​e-Ni，Fe-Co和Ni-Co三个二元体系的相似系数，其相似系数分别为0.82、0.20和0.47，表明Fe-Ni-Co三元体系不是正好是“ Kohler模型”或“ Toop模型”，因此Kohler模型和Toop模型都无法获得准确的预测值。应该推荐使用Chou模型计算的预测等粘度曲线。通过这三个模型计算出三元合金的一些活化能，并将其与三个子二元系统进行比较，并建议使用Chou模型计算出的评估活化能。除样品AE3和AE6外，由三个不同模型预测的其他活化能值在很小的范围内相似。由于三元合金的混合作用，AE3和AE6的活化能分别是最低和最高。 （C）2015韩国工业和工程化学学会。由Elsevier B.V.发布。保留所有权利。

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