Step Coalescence by Collective Motion at an Incommensurate Grain Boundary

Grain-boundary kinetics: A unified approach

“…Rajabzadeh et al observed different types of disconnections (corresponding to different disconnection modes) in a STGB in a Cu bicrystal [55]. Bowers et al also observed disconnections in an irrational (incommensurate) tilt GB in a Au bicrystal via scanning transmission electron microscopy [56]. Radetic et al found that there were disconnections in the GB of a shrinking embedded cylindrical grain in Al and Au thin films [57,58].…”

Segregation-Induced Nanofaceting Transition at an Asymmetric Tilt Grain Boundary in Copper

“…Faceting-roughening phenomena of GBs were recently summarized by Straumal et al for a great amount of different grain boundary types and in different material systems [20]. The majority of experimental and simulation work established a clear dependence of faceting-defaceting transitions on temperature in pure metal GBs [18,[21][22][23]. Some work also focused on how structural defects of a grain boundary (GB dislocations) may influence faceting by pinning or dragging facets during defect motion [24].…”

Probing Stress-Induced Grain Boundary Migration and Hypofriction at High Resolution

“…Therefore, future material development relies on a fundamental understanding of the atomic-scale structural evolution and migration mechanisms of crystalline interfaces in response to external stimuli. Our recent work identifying a mechanism of grain boundary step coalescence at ambient temperature demonstrates the power of coupling aberrationcorrected electron microscopy with atomistic simulation in understanding interface phenomena [2]. Figure 1d shows a color overlay illustrating atomic trajectories during grain boundary motion, highlighting the level of detail with which structural fluctuations can be traced experimentally.…”