Hydrogen-enhanced grain boundary vacancy stockpiling causes transgranular to intergranular fracture transition

Ding, Yu Sheng; Yu, Haiyang; Lin, Meichao; Zhao, Kongshuang; Xiao, Senbo; Vinogradov, Alexei; Li, Qiao; Ortiz, Michael; He, Jianying; Zhang, Zhiliang

doi:10.1016/j.actamat.2022.118279

Cited by 26 publications

(7 citation statements)

References 71 publications

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“…Under loading conditions, these nano/micro-voids may contribute to promoting cracking propagation. On the other hand, Ding et al reported that SH enhances grain boundary vacancies during deformation, leading to a transition from transgranular to intergranular fracture [ 35 ]. Under applied load, these nano/micro-voids can function as structural vulnerabilities where cracks easily propagate or serve as possible sites for the initiation of micro-cracks.…”

Section: Resultsmentioning

confidence: 99%

Deciphering Hydrogen Embrittlement Mechanisms in Ti6Al4V Alloy: Role of Solute Hydrogen and Hydride Phase

Nguyen,

Singh,

Lee

et al. 2024

Materials

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Ti6Al4V (Ti64) is a versatile material, finding applications in a wide range of industries due to its unique properties. However, hydrogen embrittlement (HE) poses a challenge in hydrogen-rich environments, leading to a notable reduction in strength and ductility. This study investigates the complex interplay of solute hydrogen (SH) and hydride phase (HP) formation in Ti64 by employing two different current densities during the charging process. Nanoindentation measurements reveal distinct micro-mechanical behavior in base metal, SH, and HP, providing crucial insights into HE mechanisms affecting macro-mechanical behavior. The fractography and microstructural analysis elucidate the role of SH and HP in hydrogen-assisted cracking behaviors. The presence of SH heightens intergranular cracking tendencies. In contrast, the increased volume of HP provides sites for crack initiation and propagation, resulting in a two-layer brittle fracture pattern. The current study contributes to a comprehensive understanding of HE in Ti6Al4V, essential for developing hydrogen-resistant materials.

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Section: Resultsmentioning

confidence: 99%

Deciphering Hydrogen Embrittlement Mechanisms in Ti6Al4V Alloy: Role of Solute Hydrogen and Hydride Phase

Nguyen,

Singh,

Lee

et al. 2024

Materials

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“…Hachet et al 744,746 observed similar correlation between H and the length of dislocation mean free path for the dislocation pattern produced under cyclic loading; dipolar walls spacing increased with the addition of H, which increased the length of dislocation mean free path and consequently induced a softening effect. Moreover, the authors claimed that the clusters of superabundant vacancies accelerate the H-induced softening process more than a direct impact of H. The fact that H enhances the generation of vacancies during the deformation is supported by several recent studies 175,659 and can be a rationale for H-induced IG fracture.…”

Section: Effect Of H On Apparent Elasticitymentioning

confidence: 88%

“…The fully IG fracture happens as critical vacancy concentration (1.7% for Σ5 GB) is reached, i.e., all the samples are expected to fail by IG fracture when such vacancy concentration is reached. Redrawn with permission from ref . Copyright 2022 Elsevier under [CC BY 4.0 DEED] [].…”

Section: Knowledge Base About Hementioning

confidence: 99%

“…Consequently, an extremely high concentrations of VH can be achieved during plastic deformation in the presence of H. Under such high concentrations, these VHs prefer to aggregate by absorbing additional vacancies and act as nuclei for nanovoids. These findings help to link VHs at the atomic scale to macroscopic failure by nanovoid coalescence in the presence of H. Using GCMC and MD, Ding et al proposed a vacancy-controlled GB nanovoiding mechanism to account for the TG to IG fracture transition in nickel. H was found to enhance strain-induced vacancy generation by up to ten times.…”

Section: Knowledge Base About Hementioning

confidence: 99%

“…Mechanism-based modeling is highly desirable for its sound physical basis and fewer fitting parameters, however, many underlying processes of HE, although qualitatively understood, are still yet to be implemented quantitatively. For instance, Hinduced IG fracture, decorated with nano-sized voids, may be better described with a so-called H-enhanced, strain-induced vacancy stockpiling model, 659 but it is still not possible to simulate this process numerically. While H-enhanced dis- location activity is believed to be a key mechanism for quasicleavage with tearing ridges on the surface, it is still not possible to simulate the morphology of such a quasi-cleavage surface with those microscopic features.…”

Section: Combined Effects Of Crack Tipmentioning

confidence: 99%

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Hydrogen Embrittlement as a Conspicuous Material Challenge─Comprehensive Review and Future Directions

Yu,

Díaz,

et al. 2024

Chem. Rev.

Self Cite

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Hydrogen is considered a clean and efficient energy carrier crucial for shaping the net-zero future. Large-scale production, transportation, storage, and use of green hydrogen are expected to be undertaken in the coming decades. As the smallest element in the universe, however, hydrogen can adsorb on, diffuse into, and interact with many metallic materials, degrading their mechanical properties. This multifaceted phenomenon is generically categorized as hydrogen embrittlement (HE). HE is one of the most complex material problems that arises as an outcome of the intricate interplay across specific spatial and temporal scales between the mechanical driving force and the material resistance fingerprinted by the microstructures and subsequently weakened by the presence of hydrogen. Based on recent developments in the field as well as our collective understanding, this Review is devoted to treating HE as a whole and providing a constructive and systematic discussion on hydrogen entry, diffusion, trapping, hydrogen–microstructure interaction mechanisms, and consequences of HE in steels, nickel alloys, and aluminum alloys used for energy transport and storage. HE in emerging material systems, such as high entropy alloys and additively manufactured materials, is also discussed. Priority has been particularly given to these less understood aspects. Combining perspectives of materials chemistry, materials science, mechanics, and artificial intelligence, this Review aspires to present a comprehensive and impartial viewpoint on the existing knowledge and conclude with our forecasts of various paths forward meant to fuel the exploration of future research regarding hydrogen-induced material challenges.

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Mechanistic Aspects of Fracture II—Plasticity-Dominated Fracture Models

Nagumo

2023

Fundamentals of Hydrogen Embrittlement

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Hydrogen-enhanced grain boundary vacancy stockpiling causes transgranular to intergranular fracture transition

Cited by 26 publications

References 71 publications

Deciphering Hydrogen Embrittlement Mechanisms in Ti6Al4V Alloy: Role of Solute Hydrogen and Hydride Phase

Deciphering Hydrogen Embrittlement Mechanisms in Ti6Al4V Alloy: Role of Solute Hydrogen and Hydride Phase

Hydrogen Embrittlement as a Conspicuous Material Challenge─Comprehensive Review and Future Directions

Mechanistic Aspects of Fracture II—Plasticity-Dominated Fracture Models

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