Discerning enhanced dislocation plasticity in hydrogen-charged<i>α</i>-iron nano-crystals

Wagih, Malik; Tang, Yizhe; Hatem, Tarek M.; El‐Awady, Jaafar A.

doi:10.1080/21663831.2015.1052889

Cited by 17 publications

(2 citation statements)

References 32 publications

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“…Of particular note is that in atomic simulations, the hydrogen effect on dislocation nucleation can be affected by many factors such as strain rate, nucleation source, and initial defects. Pre-existing dislocations and other types of defects cannot be neglected either in such simulations 29,30 . In contrast to the homogeneous nucleation of dislocations under nanoindentation 31 , it was found that dislocation emission from a crack tip could be suppressed by the accumulation of hydrogen 32–34 .…”

Section: Introductionmentioning

confidence: 99%

Hydrogen embrittlement in metallic nanowires

et al. 2019

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Although hydrogen embrittlement has been observed and extensively studied in a wide variety of metals and alloys, there still exist controversies over the underlying mechanisms and a fundamental understanding of hydrogen embrittlement in nanostructures is almost non-existent. Here we use metallic nanowires (NWs) as a platform to study hydrogen embrittlement in nanostructures where deformation and failure are dominated by dislocation nucleation. Based on quantitative in-situ transmission electron microscopy nanomechanical testing and molecular dynamics simulations, we report enhanced yield strength and a transition in failure mechanism from distributed plasticity to localized necking in penta-twinned Ag NWs due to the presence of surface-adsorbed hydrogen. In-situ stress relaxation experiments and simulations reveal that the observed embrittlement in metallic nanowires is governed by the hydrogen-induced suppression of dislocation nucleation at the free surface of NWs.

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Section: Introductionmentioning

confidence: 99%

Hydrogen embrittlement in metallic nanowires

et al. 2019

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“…As well as, these simulations directly improve and optimize the manufacturing process and fabrications for AM materials. Therefore, it will contribute to the final part quality and performance [9][10][11][12] . The Calculation of Phase Diagrams (CALPHAD) approach a powerful engineering method in predicting material thermodynamics and kinetics of materials based on experimental phase equilibria and thermodynamic properties [13] .…”

Section: Methodsmentioning

confidence: 99%

Multiscale experimental and modelling framework for metal additive manufacturing : Hip implant case study

Mohamed

Nabil

Alaa

et al. 2019

Eng. Sci. and Milit. Techno.

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The current work targets improving metal-based Additive Manufacturing (AM) processes ; namely, Direct Metal Laser Sintering (DMLS). This research focuses on the manufacturing of steel alloys using the DMLS process, and high-strength 174-PH Stainless steel specifically. To achieve optimal material integrity and outstanding functionalities, different processing parameters impact on AM process are explored. Furthermore, development of a design framework based on general multi-scale models is suggested. The proposed framework includes: (1) Coupled thermal/microstructural prediction of DMLS process, (2) Establishing microstructure informed numerical models for properties and failure prediction for DMLS manufactured microstructures, (3) macroscale models with homogenized properties to be used for AM parts.

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Multi-Physics Modelling of Additively Manufactured Cellular Structures Using Selective Laser Melting

El-Sadek

Hatem

2022

The Minerals, Metals &Amp; Materials Series

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Discerning enhanced dislocation plasticity in hydrogen-chargedα-iron nano-crystals

Cited by 17 publications

References 32 publications

Hydrogen embrittlement in metallic nanowires

Hydrogen embrittlement in metallic nanowires

Multiscale experimental and modelling framework for metal additive manufacturing : Hip implant case study

Multi-Physics Modelling of Additively Manufactured Cellular Structures Using Selective Laser Melting

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