Weak boundary enabled tensile ductility in dealloyed porous Fe alloy

Xie, Hui; Shao, Jun-Chao; Zou, Lijie; Jin, Hai-Jun

doi:10.1016/j.actamat.2022.118501

Cited by 5 publications

(2 citation statements)

References 72 publications

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“…25−31 Numerical simulations predominantly offer insights into specific deformation mechanisms at the atomic scale and establish corresponding scaling law correlations through parametric study. 32−37 Numerous studies 38−42 have demonstrated that NPMs exhibit limited plasticity and are prone to macroscopic brittle fracture, typically experiencing irreversible fracture strains of less than 1%, 43 which hinders its functional applications in various potential fields, such as sensing application. This poor plasticity is attributed to the irregular spatial topology of NPMs, where stress concentrations occur within small ligaments under external loading, leading to a rapid rupture.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Investigation of the Toughening Mechanism in Core–Shell Nanoporous Gold Modified by Pt Layers: Implications for Sensing Applications

Li,

Dai,

2024

ACS Appl. Nano Mater.

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Nanoporous metals demonstrate significant potential in a variety of innovative structures and functional domains, but their limited macroscopic plasticity hinders their industrial application. In this work, we constructed a core–shell structure by modifying nanoporous gold (NP-Au) with Pt atoms and investigated its mechanical response via molecular dynamics simulations. The results showed that the introduction of the Pt shell layer to form a core–shell structure effectively enhances the plasticity of NP-Au. Specifically, the lattice mismatch between the Pt shell layer and Au core layer induces elevated interfacial stress, leading to heightened initial dislocation density and intensified dislocation activity during deformation, which promotes the formation of Lomer–Cottrell locks and helps resist fracture. Additionally, the Pt shell layer mitigates strain localization and facilitates the nucleation and propagation of nanotwins. These synergistic mechanisms collectively contribute to the observed enhancement in plasticity, with greater reinforcement observed as the thickness of the Pt coating layer increases. Through quantitative comparative analysis between decorated specimens with equivalent relative density to NP-Au, it can be concluded that the strength and modulus augmentation in coated NP-Au@Pt might primarily stem from an increase in relative density rather than the special core–shell structure. Our findings clarify the toughening mechanism of the core–shell nanoporous structure, which provides a structural design strategy of ductile nanoporous materials for sensing applications.

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Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Investigation of the Toughening Mechanism in Core–Shell Nanoporous Gold Modified by Pt Layers: Implications for Sensing Applications

Li,

Dai,

2024

ACS Appl. Nano Mater.

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“…Moreover, porous pure Fe cannot be obtained by liquid metal dealloying for that an acid etching process after dealloying is necessary for this method to remove the residual impurities. Although some alloy elements are added to improve the corrosion resistance of Fe, and some Fe-based alloys with porous structures, such as porous Fe-Cr [17][18][19], Fe-Cr-Mn [20,21] and Fe-Mo [22] alloy, have been successfully fabricated via liquid metal dealloying, the obtained porous alloys typically have fairly large ligament sizes and therefore small specific surface areas. To our knowledge, the fabrication of NP-Fe has not been reported in previous works.…”

Section: Introductionmentioning

confidence: 99%

Rapid fabrication of nanoporous iron by atmospheric plasma for efficient wastewater treatment

et al. 2023

Nanotechnology

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Nanoporous (NP) iron with large surface area is highly desired for wastewater degradation catalysis. However, it remains a challenge for the fabrication of NP-Fe because the conventional aqueous dealloying or liquid metal dealloying are not applicable. Herein, a novel and universal plasma-assisted electro-dealloying (PED) technique was utilized to fabricate NP-Fe. The NP-Fe demonstrates evenly distributed pore structure. The pore density can be tuned by the variation of the ratio of Fe and Zn in the precursor, and the average pore size can be tuned by the processing time. Owing to its large specific surface area, the NP-Fe shows excellent wastewater degradation performance, which is 26 times better than that of commercial zero–valent iron (ZVI) catalysts. This study provides a useful approach to fabricate NP active metals with enhanced catalytic performance.

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Unveil the brittle-flexible transition mechanism of partially dealloyed Ni-Zr-Ti metallic glasses

Sun,

Liu,

Zheng

et al. 2024

Corrosion Science

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Weak boundary enabled tensile ductility in dealloyed porous Fe alloy

Cited by 5 publications

References 72 publications

Molecular Dynamics Investigation of the Toughening Mechanism in Core–Shell Nanoporous Gold Modified by Pt Layers: Implications for Sensing Applications

Molecular Dynamics Investigation of the Toughening Mechanism in Core–Shell Nanoporous Gold Modified by Pt Layers: Implications for Sensing Applications

Rapid fabrication of nanoporous iron by atmospheric plasma for efficient wastewater treatment

Unveil the brittle-flexible transition mechanism of partially dealloyed Ni-Zr-Ti metallic glasses

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