Co-Nb-W体系热力学评价

IF 0.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY 稀有金属材料与工程 Pub Date : 2018-10-01 DOI:10.1016/S1875-5372(18)30212-1

Liu Xingjun , Niu Zeming , Lu Yong , Guo Yihui , Han Jiajia , Chen Yuechao , Wang Cuiping

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引用次数: 1

摘要

应用CALPHAD方法对钴-铌-钨三元体系进行了热力学评价。为了统一Co-Nb-W体系中的μ相模型，对Co-W二元体系进行了轻微的修改。在1273、1373和1473 K的三个已发表的等温剖面进行了严格的检查，并用于优化模型参数。将α - co和bcc作为替代溶液;λ、χ和Co3Nb相使用双亚晶格模型进行了评估。Co7W6和Co7Nb6相描述为(Co, Nb)1(Co, Nb, W)2(Co, Nb, W)4(Co)6。计算的等温剖面和垂直剖面与实验数据吻合较好。

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Thermodynamic Assessment of Co-Nb-W System

The thermodynamic assessment of the Co-Nb-W ternary system has been carried out by applying the CALPHAD method. A slight modification of the Co-W binary system has been performed to unify the model of μ phase in Co-Nb-W system. The three published isothermal sections at 1273, 1373 and 1473 K have been critically examined and used to optimize the model parameters. The solution phases, including αCo and bcc were modeled as substitutional solutions; the λ, χ, and Co₃Nb phases have been assessed using two-sublattice models. The Co₇W₆ and Co₇Nb₆ phases were described as (Co, Nb)₁(Co, Nb, W)₂(Co, Nb, W)₄(Co)₆. Calculated isothermal sections and vertical sections agreed well with the experimental data.