Abstract
It is possible for $\ensuremath{\langle}110\ensuremath{\rangle}$ tilt grain boundaries (GBs) in bcc metals to perform a conservative displacement by the glide of intrinsic GB line defects, namely, disconnections. The paper presents the characteristic of these defects in ${112}$ and ${332}$ twin boundaries, their vicinal GBs, and the ${116}$ GB studied by molecular dynamics simulation. The sources of disconnections and their interaction with the other GB dislocations are described together with their role in the shear-coupled GB migration. The absence of gliding disconnections in the ${111}$ GB impedes the shear-coupled GB migration, but two pure shuffles inside the coincident site lattice unit facilitate the transformation of the ${111}$ GB into ${110}/{001}$ or ${110}/{112}$ facets in regions of concentration of stresses.
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