Thermodynamic modeling of the Zr-H-Nb system on the Zr-rich side and application |
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| Authors: | Jianwei Wang Lijun Wang Qian Huang |
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| Affiliation: | a Division of Mineral Resources, Metallurgy and Materials, General Research Institute for Nonferrous Metals, Beijing 100088, PR China
b School of Mechanical Electronic and Information Engineer, China University of Mining and Technology, Beijing 100083, PR China |
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| Abstract: | A thermodynamic modeling of the Zr-H-Nb system on the Zr-rich side (wt.%Nb ? 2.5) was established using CALPHAD (CALculation of PHAse Diagrams) method. The calculated pressure-composition isotherms and the composition limits in the two-phase (bcc + fcc) region agree well with the experimental data. Meanwhile, some thermodynamic data of Zr-H-Nb system (wt.%Nb = 1, PH2=101.325 kPa) was calculated, such as equilibrium hydrogen concentration, phase composition and phase transition temperature, which was applied to guide the preparation of the crack-free zirconium hydride. The hydriding of Zr-1 wt.%Nb alloys was carried out and the crack-free zirconium hydrides with hydrogen concentration of 1.6H/Zr (at.) and 1.8H/Zr were prepared respectively based on the calculated results. |
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