Co-Nb-W三元系的热力学评估（英文）  

Thermodynamic Assessment of Co-Nb-W System

作　　者：刘兴军[1,2] 牛泽明 卢勇[1] 郭毅慧 韩佳甲[1] 陈悦超 王翠萍[1,2] 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)

机构地区：[1]厦门大学材料学院,福建厦门361005 [2]厦门大学福建省材料基因工程重点实验室,福建厦门361005

出　　处：《稀有金属材料与工程》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)

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.

关 键 词：热力学计算 CALPHAD Co-W合金 Co-Nb-W合金 

分 类 号：TG146.16[一般工业技术—材料科学与工程]