Stress-driven migration of deformation-distorted grain boundaries in nanomaterials

Time-Response-Histogram-Based Feature of Magnetic Barkhausen Noise for Material Characterization Considering Influences of Grain and Grain Boundary under In Situ Tensile Test

“…The grain boundary affects the movement of DWs and leads to different magnetization processes under stress in the previous research [ 45 ]. From Figure 4 d,e, there were more domain walls around the grain boundary S1-gb13 during magnetization, and the time required to make material achieve saturation was longer around the grain boundary than inside the grain.…”

Structure and Properties of Pseudo-Graphenes. Review

“…Bobylev and Ovid'ko [53] extended description above on deformation-distorted GBs -non-equilibrium GBs containing trapped ensembles of lattice dislocations (Fig. 9) typical for NC and UFG materials produced by severe plastic deformation methods.…”

“…Alternative role of stress-driven GB migration as a process responsible for nucleation of new nano-grains in NC and UFG materials (deformation-induced grain refinement) has been suggested and investigated in a number of works [40,41,[49][50][51][52][53]. The common approach employed in these works is a disclination description of stress-induced GB splitting and migration (modeled as splitting and movement of disclination dipoles) resulting in nucleation of new nanograins.…”

“…They can be arranged either (a) periodically or (b) randomly. Reproduced from [53] with permission. Copyright (2015), Elsevier.…”

Grain Boundaries and Diffusion Phenomena in Severely Deformed Materials

“…21,22) Thus, quantifying the impact of the individual contributions of different SPD conditions or materials properties, such as the stacking fault energy on the microstructures and the related properties of the ultrafine grained or nanocrystalline materials is still a challenging task. 23) Additionally, there have been many discussions in the literature recently on the importance of twinning 24,25) and stress-driven grain boundary migration 26) as two alternative mechanisms for stress accommodation in ultrafine grainedand nanocrystalline materials, i.e. in situations where the conventional dislocation-based plasticity is near to exhaustion.…”