Impact of angular deviation from coincidence site lattice grain boundaries on hydrogen segregation and diffusion in α-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 deviation from the perfect ∑3(111)[110] GBs in α-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 diff usivity along the ideal GB is observed to be the highest.

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This work was supported by the National Science Foundation CAREER Award #CMMI-1454072 and Academy of Scientific Research and Technology JESOR grant #17.

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Correspondence to Tarek M. Hatem.

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Hamza, M.H., Hendy, M.A., Hatem, T.M. et al. Impact of angular deviation from coincidence site lattice grain boundaries on hydrogen segregation and diffusion in α-iron. MRS Communications 8, 1197–1203 (2018).

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