On the mechanism of shear-coupled grain boundary migration in FCC crystals

R Verma and DA Molodov and A Ostapovets, PHILOSOPHICAL MAGAZINE (2025).

DOI: 10.1080/14786435.2025.2586373

One of the possible mechanisms of metal plasticity is shear-coupled migration of grain boundaries under applied mechanical stress. Several different approaches to the description of shear-coupled migration of grain boundaries and to the prediction of the coupling factor exist in the literature. Some of them are based on the solution of Frank-Bilby equation and consideration of grain boundary (GB) dislocation content; other is based on consideration of disconnection glide along the GB. The first approach describes the boundary as an array of dislocations; the second one considers the glide of disconnection along a dislocation-free boundary. Despite the existence of opinions that these approaches are incompatible, we demonstrate internal interrelation between them by consideration of shear-coupled migration of Sigma 3(111) boundary in face-centred cubic copper. It is demonstrated that there is no contradiction between approaches and their combination can help to understand the physical mechanisms of shear-coupled boundary migration.

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