Journal of Materials Science

, Volume 41, Issue 23, pp 7741–7746 | Cite as

The role of partial grain boundary dislocations in grain boundary sliding and coupled grain boundary motion

  • Joshua Monk
  • Brian Hyde
  • Diana FarkasEmail author


We study the process of grain boundary sliding through the motion of grain boundary dislocations, utilizing molecular dynamics and embedded atom method (EAM) interatomic potentials. For a Σ = 5 [001]{310} symmetrical tilt boundary in bcc Fe, the sliding process was found to occur through the nucleation and glide of partial grain boundary dislocations, with a secondary grain boundary structure playing an important role in the sliding process. While the homogeneous nucleation of these grain boundary dislocations requires shear strain levels higher than 7%, preexisting grain boundary dislocations are shown to glide at applied shear levels of 1.5%. The glide of the dislocations results in coupled motion of the boundary in the directions parallel and perpendicular to itself. Finally, interstitial impurities and vacancies were introduced in the grain boundary to study the effects on the sliding resistance of the boundary. While vacancies and H interstitials act as preferred nucleation sites, C interstitials do not. Both hydrogen and C interstitials stop dislocation glide whereas vacancies do not. A detailed study of the dynamic properties of these dislocations is also presented.


Boundary Structure Applied Shear Lattice Dislocation Lower Energy Structure Boundary Dislocation 



This work was supported by NSF, Materials Theory.


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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  1. 1.Department of Materials Science and EngineeringVirginia Tech.BlacksburgUSA

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