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刘兴军,牛泽明.Co-Nb-W三元系相图的热力学计算[J].稀有金属材料与工程(英文),2018,47(10):2919~2926.[liuxingjun and niuzeming.Thermodynamic Assessment of the Co-Nb-W System[J].Rare Metal Materials and Engineering,2018,47(10):2919~2926.]
Thermodynamic Assessment of the Co-Nb-W System
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Received:April 06, 2017  Revised:June 14, 2017
Key words: Thermodynamic calculation  CALPHAD  Co-W system  Co-Nb-W system
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目);科技部国际科技合作专项; 国家自然科学基金青年基金
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liuxingjun and niuzeming  
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      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 by 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.