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,2018,47(10):2919~2926.[liuxingjun,niuzeming.Thermodynamic Assessment of the Co-Nb-W System[J].Rare Metal Materials and Engineering,2018,47(10):2919~2926.]
Co-Nb-W三元系相图的热力学计算
投稿时间:2017-04-06  修订日期:2017-06-14
中文关键词:  热力学计算  CALPHAD  Co-W 二元系  Co-Nb-W 三元系
基金项目: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
中文摘要:
      基于Co-Nb-W三元体系的相平衡和热力学的实验信息,采用Calphad方法修改了Co-W二元体系的部分相模型,以评估Co-Nb-W三元体系1273、1373、1473 K的等温截面相图。Co-Nb-W三元体系热力学评估过程中,αCo和BCC相采用溶体相模型; λ、χ、Co3Nb相采用双亚点阵模型;Co7W6、Co7Nb6相描述在同一四亚点阵模型 (Co, Nb)1(Co, Nb, W)2(Co, Nb, W)4(Co)6中。结果表明,计算所得相图较好的符合实验数据。
Thermodynamic Assessment of the Co-Nb-W System
英文关键词:Thermodynamic calculation  CALPHAD  Co-W system  Co-Nb-W system
英文摘要:
      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.
作者单位E-mail
刘兴军 厦门大学材料学院 lxj@xmu.edu.cn 
牛泽明 厦门大学材料学院 450431974@qq.com 
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