Disconnection-mediated motion of < 110 > tilt grain boundaries in alpha- Fe

N Kvashin and N Anento and A Serra, PHYSICAL REVIEW MATERIALS, 6, 053607 (2022).

DOI: 10.1103/PhysRevMaterials.6.053607

It is possible for < 110 > 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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