A phase-field study on the hydrogen-induced pitting corrosion with solid–solid phase transformation in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si12.svg" display="inline" id="d1e1080"><mml:mi>α</mml:mi></mml:math>-Uranium

Sheng, Jie; Wang, Yuechao; Liu, Yu; Wu, Shuai; Xu, Ke; Zi-Hang, Chen,; Sun, Bo; Liu, Haifeng; Song, Haifeng

doi:10.1016/j.commatsci.2022.111663

Cited by 4 publications

(2 citation statements)

References 42 publications

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“…To improve the numerical stability of the calculation, the molar Gibbs free energies G α m and G δ m are approximated by using quadratic polynomials near the equilibrium composition. Based on parabola approximation, [36,45,46] the molar Gibbs free energies G α m and G δ m are written as…”

Section: Bulk Free Energy Densitymentioning

confidence: 99%

Phase-field simulations of the effect of temperature and interface for zirconium δ-hydrides

Chen 陈,

Sheng 盛,

Liu 刘

et al. 2024

Chinese Phys. B

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Hydride precipitation in zirconium cladding materials can damage their integrity and durability. Service temperature and material defects have a significant effect on the dynamic growth of hydrides. In this study, we have developed a phase-field model based on the assumption of elastic behaviour within a specific temperature range (613 - 653 K). This model allows us to study the influence of temperature and interfacial effects on the morphology, stress, and average growth rate of zirconium hydride. The results suggest that changes in temperature and interfacial energy influence the length-to-thickness ratio and average growth rate of the hydride morphology. The ultimate determinant of hydride orientation is the loss of interfacial coherency, primarily induced by interfacial dislocation defects and quantifiable by the mismatch degree q. An escalation in interfacial coherency loss leads to a transition of hydride growth from horizontal to vertical, accompanied by the onset of redirection behaviour. Interestingly, redirection occurs at a critical mismatch level, denoted q c , and remains unaffected by variations in temperature and interfacial energy. However, this redirection leads to an increase in the maximum stress, which may influence the direction of hydride crack propagation. This research highlights the importance of interfacial coherency and provides valuable insights into the morphology and growth kinetics of hydrides in zirconium alloys.

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Section: Bulk Free Energy Densitymentioning

confidence: 99%

Phase-field simulations of the effect of temperature and interface for zirconium δ-hydrides

Chen 陈,

Sheng 盛,

Liu 刘

et al. 2024

Chinese Phys. B

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“…经过换算, 该条件下模拟中τ = 550 s的累计裂变时间对应实际燃耗25.03 GWd/tU (UO 2 密度取10 t/m 3 ), 在这一时刻, 燃料中裂变气体气泡分布(图3(f))与Zacharie等 [35] 实验中得到的在堆芯温度不超过1100 ℃的反应堆中燃烧至25 GWd/tU 3种温度下气泡面积占整个模拟区域面积的…”

Section: 控制方程unclassified

Phase-field simulation on fission gas release behavior of large grain UO<sub>2</sub> fuel

Liu,

Wang,

Zhang

et al. 2024

Acta Phys. Sin.

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To predict the release behavior of fission gas in large grain UO2 fuel and provide support for the development of accident tolerant fuel, this study used a phase-field model to simulate the release behavior of fission gas in the microstructure of UO2 polycrystalline. This model adopts a set of coupled Cahn-Hilliard equations and Allen-Cahn equations, using conserved field variables to represent the distribution of fission gas and vacancies, and distinguishing bubble phase from matrix phase using order parameters. This model focuses on investigating the effects of different grain sizes, temperature conditions, and diffusion coefficients on the release behavior of fission gases, demonstrating the nucleation, growth, and fusion behavior of bubbles. Simulation results were obtained for fuel porosity, bubble coverage on grain boundaries, and average bubble radius at a certain degree of burnup. The results show that temperature and diffusion coefficient have a significant impact on porosity and bubble coverage on grain boundaries. When the diffusion coefficient is high, grain size also has a significant impact on fission gas release behavior. And when the diffusion coefficient is low, the influence of grain size is not significant. In addition, the distribution of fission gas bubbles under high burnup obtained through this model is also in good agreement with experimental results. The model can predict the release behavior of fission gas in large grain UO2 fuel.

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A multiphase-field model for simulating the hydrogen-induced multi-spot corrosion on the surface of polycrystalline metals: Application to uranium metal

Sheng,

Liu,

Shi

et al. 2024

Computational Materials Science

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A phase-field study on the hydrogen-induced pitting corrosion with solid–solid phase transformation in α-Uranium

Cited by 4 publications

References 42 publications

Phase-field simulations of the effect of temperature and interface for zirconium δ-hydrides

Phase-field simulations of the effect of temperature and interface for zirconium δ-hydrides

Phase-field simulation on fission gas release behavior of large grain UO<sub>2</sub> fuel

A multiphase-field model for simulating the hydrogen-induced multi-spot corrosion on the surface of polycrystalline metals: Application to uranium metal

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