Atomic-scale quantification of grain boundary segregation in nanocrystalline material

  • Herbig M
  • Raabe D
  • Li Y
 et al. 
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Grain boundary segregation leads to nanoscale chemical variations that can alter a material's performance by orders ofmagnitude (e.g., embrittlement). To understand this phenomenon, a large number of grain boundaries must be characterized in terms of both their five crystallographic interface parameters and their atomic-scale chemical composition. We demonstrate how this can be achieved using an approach that combines the accuracy of structural characterization in transmission electronmicroscopy with the 3Dchemical sensitivity of atom probe tomography.We find a linear trend between carbon segregation and themisorientation angle ω for low-angle grain boundaries in ferrite, which indicates that ω is themost influential crystallographic parameter in this regime. However, there are significant deviations from this linear trend indicating an additional strong influence of other crystallographic parameters (grain boundary plane, rotation axis). For high-angle grain boundaries, no general trend between carbon excess and ω is observed; i.e., the grain boundary plane and rotation axis have an even higher influence on the segregation behavior in this regime. Slight deviations from special grain boundary configurations are shown to lead to unexpectedly high levels of segregation. DOI:

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  • M. Herbig

  • D. Raabe

  • Y. J. Li

  • P. Choi

  • S. Zaefferer

  • S. Goto

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