Quantifying hydrogen concentration in the vicinity of zirconium hydrides and deformation twins

Tondro, Alireza; Abdolvand, Hamidreza

doi:10.1016/j.jmps.2020.104287

Cited by 29 publications

(4 citation statements)

References 68 publications

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“…Among these phases, ζ and γ are considered unstable while the ε phase only exists at very high levels of hydrogen content. Due to post-hydrogenation stabilization treatment applied to our samples, stable δ-phase ZrH 1.66 was achieved, this being the most prevalent form of hydride found within zirconium alloys [ 21 , 22 ].…”

Section: Resultsmentioning

confidence: 99%

Effects of Hydrogenation on the Corrosion Behavior of Zircaloy-4

Yue,

Zhou,

Zhao

et al. 2024

Materials

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Hydrogen plays an important role in the corrosion of zirconium alloys, and the degree of influence highly depends on the alloy composition and conditions. In this work, the effects of hydrogenation on the corrosion behavior of Zircaloy-4 in water containing 3.5 ppm Li + 1000 ppm B at 360 °C/18.6 MPa were investigated. The results revealed that hydrogenation can shorten the corrosion transition time and increase the corrosion rates of Zircaloy-4. The higher corrosion rates can be ascribed to the larger stress in the oxide film of hydrogenated samples, which can accelerate the evolution of the microstructure of the oxide film. In addition, we also found that hydrogenation has little effect on the t-ZrO2 content in the oxide film and there is no direct correspondence between the t-ZrO2 content and the corrosion resistance of the Zircaloy-4.

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Section: Resultsmentioning

confidence: 99%

Effects of Hydrogenation on the Corrosion Behavior of Zircaloy-4

Yue,

Zhou,

Zhao

et al. 2024

Materials

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“…It is necessary to perform in situ observations and explore the link between microscale- and the mesoscale-reorientated hydrides. Furthermore, the influence of interface and irradiation defects on hydride reorientation requires further investigation [ 5 , 98 , 110 , 168 ].…”

Section: Conclusion and Prospectsmentioning

confidence: 99%

Mechanisms of Hydride Nucleation, Growth, Reorientation, and Embrittlement in Zirconium: A Review

Jia

Han

2023

Materials

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Zirconium (Zr) hydrides threaten the reliability of fuel assembly and have repeatedly induced failures in cladding tubes and pressure vessels. Thus, they attract a broad range of research interests. For example, delayed hydride cracking induced a severe fracture and failure in a Zircaloy-2 pressure tube in 1983, causing the emergency shutdown of the Pickering nuclear reactor. Hydride has high hardness and very low toughness, and it tends to aggregate toward cooler or tensile regions, which initiates localized hydride precipitation and results in delayed hydride cracking. Notably, hydride reorientation under tensile stress substantially decreases the fracture toughness and increases the ductile-to-brittle transition temperature of Zr alloys, which reduces the safety of the long-term storage of spent nuclear fuel. Therefore, improving our knowledge of Zr hydrides is useful for effectively controlling hydride embrittlement in fuel assembly. The aim of this review is to reorganize the mechanisms of hydride nucleation and growth behaviors, hydride reorientation under external stress, and hydride-induced embrittlement. We revisit important examples of progress of research in this field and emphasize the key future aspects of research on Zr hydrides.

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“…For simplicity, we have chosen to describe the constitutive behaviour of the solid using 𝐽 2 plasticity theory. The framework can readily be incorporated to capture the role of crystal anisotropy (Castelluccio et al, 2018;Kumar and Mahajan, 2020;Tondro and Abdolvand, 2021) and dislocation hardening due to plastic strain gradients (Komaragiri et al, 2008;. The former is mostly relevant for predicting pit nucleation and the growth of very small cracks (smaller than a characteristic microstructural length).…”

Section: Chemo-elastoplasticitymentioning

confidence: 99%