Estimation of thermodynamic properties of Cu–La binary alloy with modified Miedema’s theory
- Авторы: Li H.1,2, Zhang S.2, Chen Y.2, Cheng M.2, Song H.2, Liu J.2
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Учреждения:
- School of Environment and Materials Engineering
- Institute of Metal Research
- Выпуск: Том 90, № 1 (2016)
- Страницы: 11-17
- Раздел: Chemical Thermodynamics and Thermochemistry
- URL: https://journals.rcsi.science/0036-0244/article/view/167493
- DOI: https://doi.org/10.1134/S003602441601012X
- ID: 167493
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Аннотация
According to modified Miedema’s theory, mixing enthalpies (ΔH), excess entropies (SE), excess Gibbs free energy (GE), and component activities (a) of Cu–La binary alloy were estimated using the basic thermodynamic principles and some simple physical parameters of Cu and La, such as electronegativity, atomic volume and electron density. Based on the Cu–La binary alloy phase diagram, the Gibbs free energy of the phase precipitation reactions of Cu6La and Cu5La was deduced. The results showed that the values of ΔH, SE, and GE of Cu–La binary alloy were all negative. Compared to the ideal solution, the activities of the components presented a large negative deviation from Raoult’s law, which indicated that there was a strong interaction between Cu and La. The calculated data are well consistent with the experimental data. The Gibbs free energies of the phase precipitation reactions of Cu6La are lower than those for Cu5La, which means that Cu6La is thermodynamically more stable than Cu5La. Furthermore, the experimental results show that rareearth rich Cu6La phase particles in copper matrix are formed after La microalloying.
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Об авторах
Hai-hong Li
School of Environment and Materials Engineering; Institute of Metal Research
Email: shzhang@imr.ac.cn
Китай, Yantai, 264005; Shenyang, 110016
Shi-hong Zhang
Institute of Metal Research
Автор, ответственный за переписку.
Email: shzhang@imr.ac.cn
Китай, Shenyang, 110016
Yan Chen
Institute of Metal Research
Email: shzhang@imr.ac.cn
Китай, Shenyang, 110016
Ming Cheng
Institute of Metal Research
Email: shzhang@imr.ac.cn
Китай, Shenyang, 110016
Hong-wu Song
Institute of Metal Research
Email: shzhang@imr.ac.cn
Китай, Shenyang, 110016
Jin-song Liu
Institute of Metal Research
Email: shzhang@imr.ac.cn
Китай, Shenyang, 110016