Impact of Angular Deviation from Coincidence Site Lattice Grain Boundaries on Hydrogen Segregation and Diffusion in Alpha-iron

Coincidence Site Lattice (CSL) grain boundaries (GBs) are believed to be low-energy, resistant to intergranular fracture, as well as to hydrogen embrittlement. Nevertheless, the behavior of CSL-GBs are generally confused with their angular deviations. In the current study, the effect of angular devi...

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Bibliographic Details
Published in:arXiv.org 2018-10
Main Authors: Hamza, Mohamed H, Hendy, Mohamed A, Hatem, Tarek M, El-Awady, Jaafar A
Format: Article
Language:English
Subjects:
Alpha iron
Computer simulation
Deviation
Grain boundaries
Hydrogen
Hydrogen embrittlement
Intergranular fracture
Online Access:Get full text
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Summary:Coincidence Site Lattice (CSL) grain boundaries (GBs) are believed to be low-energy, resistant to intergranular fracture, as well as to hydrogen embrittlement. Nevertheless, the behavior of CSL-GBs are generally confused with their angular deviations. In the current study, the effect of angular deviation from the perfect sigma3 (111) [1-10] GBs in Alpha-iron on the hydrogen diffusion and the susceptibility of the GB to hydrogen embrittlement is investigated through molecular static and dynamics simulations. By utilizing Rice-Wang model it is shown that the ideal GB shows the highest resistance to decohesion below the hydrogen saturation limit. Finally, the hydrogen diffusivity along the ideal GB is observed to be the highest.
ISSN:2331-8422
DOI:10.48550/arxiv.1810.02988