摘要
采用CALPHAD方法对Co-Nb-W三元系合金开展了热力学评估。为了统一Co-Nb-W三元系中μ相的热力学模型,首先对Co-W二元系的热力学进行了优化,并采用文献报道的1273、1373和1473 K 3个等温截面的相平衡实验数据开展了模型参数的优化。优化过程中采用亚正规溶体模型描述αCo和bcc等固溶体相,而λ、χ和Co_3Nb相则采用双亚点阵模型来描述,Co_7W_6和Co_7Nb_6相所用的点阵模型为(Co,Nb)_1(Co,Nb,W)_2(Co,Nb,W)_4(Co)_6。计算的等温截面和纵截面相图与实验结果取得了很好的一致性。
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 ofμphase 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,includingαCo and bcc were modeled as substitutional solutions;theλ,χ,and Co_3Nb phases have been assessed using two-sublattice models.The Co_7W_6 and Co_7Nb_6 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
刘兴军
牛泽明
卢勇
郭毅慧
韩佳甲
陈悦超
王翠萍
Liu Xingjun1,2, Niu Zeming1, Wang Cuiping1,2 Lu Yong1, Guo Yihui1, Han Jiajia1, Chen Yuechao1(1. College of Materials, Xiamen University, Xiamen 361005, China; 2 Fujian Key Laboratory of Materials Genome, Xiamen University, Xiamen 361005, China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2018年第10期2919-2926,共8页
Rare Metal Materials and Engineering
基金
National Key Basic Research and Development Program of China("973" Program)(2016YFB0701401)
