Comparison of irradiation hardening and microstructure evolution in ion-irradiated delta and epsilon hydrides

Oono, Naoko; Kasada, Ryuta; Higuchi, Toru; Sakamoto, Kunio; Nakatsuka, Masafumi; Hasegawa, Akiko; Kondo, Sosuke; Iwata, Naoki; Matsui, Hideki; Kimura, Akihiko

doi:10.1016/j.jnucmat.2013.03.013

Cited by 17 publications

(5 citation statements)

References 24 publications

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“…On the other hand, Xu & Shi [95] measured by nanoindentation an average hardness of the zirconium matrix of 4.8 GPa and ε-hydrides of 3.3 GPa which is too high because of ISE at the low penetration depths. The same problem is found with the results of Kuroda et al [96] (4 GPa) and those of Oono et al [99] (3-4 GPa) for δ-zirconium hydride. It can simply be concluded that the δ-hydrides are harder than the ε-hydrides and harder than the zirconium matrix.…”

Section: Some Interactions Between Hydrides and Deformation Modes And Their Implications On Strain Hardeningsupporting

confidence: 86%

“…However, the hardness and the yield stress at room temperature are very sensitive to the hydrogen content and therefore to the nature of hydrides both for titanium and for zirconium and its alloys. Most authors [92][93][94][95][96][97][98][99] show that titanium or zirconium hydrides (γ, δ or ε) have a higher Young's modulus, hardness and yield strength than those of pure metal but decrease with increasing hydrogen content. Only Setoyama et al [100] observe a decrease in Young's modulus and Vickers hardness of δ-hydrides TiH 2−x compared to pure titanium.…”

Section: Some Interactions Between Hydrides and Deformation Modes And Their Implications On Strain Hardeningmentioning

confidence: 99%

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Solute hydrogen and hydride phase implications on the plasticity of zirconium and titanium alloys: a review and some recent advances

Conforto

Guillot

Feaugas

2017

Phil. Trans. R. Soc. A.

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In this contribution, we propose a review of the possible implications of hydrogen on mechanical behaviour of Zr and Ti alloys with emphasis on the mechanisms of plasticity and strain hardening. Recent advances on the impact of oxygen and hydrogen on the activation volume show that oxygen content hinders creep but hydrogen partially screens this effect. Both aspects are discussed in terms of a locking-unlocking model of the screw dislocation mobility in prismatic slip. Additionally, possible extension of this behaviour is suggested for the [Formula: see text] pyramidal slip. The low hydrogen solubility in both Zr and Ti leads in many cases to hydride precipitation. The nature of these phases depends on the hydrogen content and can show crystallographic orientation relationships with the hexagonal compact structure of the alloys. Some advances on the thermal stability of these phases are illustrated and discussed in relation with the deepening of the misfit dislocations. Under tensile loading, we showed that hydrides enhance the hardening process in relation with internal stress due to strain incompatibilities between the Zr and Ti matrix and hydride phases. Different plastic yielding processes of hydrides were identified, which progressively reduce these strain incompatibilities.This article is part of the themed issue 'The challenges of hydrogen and metals'.

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Section: Some Interactions Between Hydrides and Deformation Modes And Their Implications On Strain Hardeningsupporting

confidence: 86%

Section: Some Interactions Between Hydrides and Deformation Modes And Their Implications On Strain Hardeningmentioning

confidence: 99%

Solute hydrogen and hydride phase implications on the plasticity of zirconium and titanium alloys: a review and some recent advances

Conforto

Guillot

Feaugas

2017

Phil. Trans. R. Soc. A.

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“…For the irradiation study, the data analysis must incorporate the effects of irradiation defects (e.g., point defects, dislocation loop, cavity) on the hardness and modulus in addition to the effects of stoichiometry. The modulus could be more sensitive to stoichiometry change than irradiation defects, but hardness could also be highly affected by irradiation defects [19]. This requires further investigation.…”

Section: Discussionmentioning

confidence: 99%

Kinetics of Hydrogen Desorption from Yttrium Hydride: The Development of Material Characterization Methods

Koyanagi

Gietl

Garrison

2021

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“…Due to the retarding effect of irradiation defects on hydride deformation, the hardness of δ and ε hydrides increases to 1.2 and 1.7 times after 5 dpa irradiation, respectively [ 90 ]. During deformation, the hardened hydride phase and hydride–matrix interface can serve as channels for rapid crack propagation [ 5 ].…”

Section: Hydride Nucleation and Growth Behaviorsmentioning

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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Comparison of irradiation hardening and microstructure evolution in ion-irradiated delta and epsilon hydrides

Cited by 17 publications

References 24 publications

Solute hydrogen and hydride phase implications on the plasticity of zirconium and titanium alloys: a review and some recent advances

Solute hydrogen and hydride phase implications on the plasticity of zirconium and titanium alloys: a review and some recent advances

Kinetics of Hydrogen Desorption from Yttrium Hydride: The Development of Material Characterization Methods

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

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