4.3 Article

Disconnection-mediated motion of ⟨110⟩ tilt grain boundaries in α-Fe

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PHYSICAL REVIEW MATERIALS
卷 6, 期 5, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevMaterials.6.053607

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  1. Euratom research and training programme 2014-2018 [755039]

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This paper presents a study on the disconnections in <110> tilt grain boundaries in bcc metals and their role in GB migration. The characteristics and behaviors of these disconnections in different types of GBs are examined.
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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