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Thermodynamic Assessment of the Co-Cr-Nb System
Journal of Phase Equilibria and Diffusion ( IF 1.5 ) Pub Date : 2021-03-17 , DOI: 10.1007/s11669-021-00875-z
X. J. Liu , Q. Q. Zhang , Y. Lu , J. J. Han , Y. H. Guo , Z. F. Tao , Y. X. Huang , C. P. Wang

In this work, the Co-Cr-Nb ternary system was evaluated using the CALPHAD technique based on the experimental measurements of the isothermal sections at 1000, 1100 and 1200 °C. The solution phases including Liquid, Bcc, Fcc and Hcp were described by a substitutional solution model. The Laves phases were described by a two-sublattice model. The σ phase was described by a three-sublattice model of (Co,Nb)8Cr4(Co,Cr,Nb)18 and the μ phase was described by a four-sublattice model of Co1(Co,Cr,Nb)2(Nb)4(Co,Cr,Nb)6. The Co7Nb2 was treated as a stoichiometric compound. A set of self-consistent thermodynamic parameters for the Gibbs energies of individual phase in the Co-Cr-Nb system has been obtained which leads to a great fit between calculated results and experimented data. The calculated liquidus projection and reaction scheme of the Co-Cr-Nb ternary system have also been presented.



中文翻译:

Co-Cr-Nb系统的热力学评估

在这项工作中,使用CALPHAD技术基于在1000、1100和1200°C下等温截面的实验测量值对Co-Cr-Nb三元体系进行了评估。通过替代溶液模型描述了溶液阶段,包括液相,密件抄送,FCC和Hcp。Laves相用两个子格模型描述。σ相由(Co,Nb)8 Cr 4(Co,Cr,Nb)18的三子晶格模型描述,μ相由Co 1( Co,Cr,Nb)的四子晶格模型描述2(Nb)4(Co,Cr,Nb)6。Co 7 Nb 2被视为化学计量的化合物。已经获得了一组用于Co-Cr-Nb系统中各个相的吉布斯能量的自洽热力学参数,这使得计算结果与实验数据非常吻合。还提出了计算出的Co-Cr-Nb三元体系的液相线预测值和反应方案。

更新日期:2021-03-17
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