Conditions of Strain-Induced Facet Formation during Interaction between a Lattice Dislocation Pile-Up and a Grain Boundary

Dislocation pileups in small grains

“…These studies illustrate the ongoing scientific interest in the topic but do not alter the general conclusions on the role of DPUs in relationship to the GSE. The interaction between a pileup and a disclination was studied by Rybin et al (2018) and Perevezentsev et al (2020). These simplified models incorporate the strain-induced GB-deformation which was studied with an advanced multiscale model by Peng et al (2022).…”

Nanopore Formation at the Junctions of the Polycrystal Intergranular Boundary Under Plastic Deformation

“…A dislocation-type concentrator is a dislocation that takes place at the junction of grain boundaries. The junction dislocation is an analogue of the lattice dislocation, but it is considered not as a part of the crystal lattice of an individual grain, but in conditional (virtual) constructs: the lattice of grain boundary shifts, the complete lattice of overlaps, and the lattice of coincident nodes of crystal grains forming the junction [41], [42]. Such concentrators play a defining role in the further evolution of the polycrystal, being responsible for local accommodation processes.…”

Crack Initiation at Grain Boundary With a Variable Misorientation Vector

“…В результате вдоль «ножевой» границы возникает цепочка дисклинаций одного знака, расположенных в точках ее ветвления. Теоретически условия появления трещин вблизи дисклинаций рассматривались в публикациях [7][8][9][10][11][12][13][14][15][16]. Дисклинационные модели разрушения применительно к деформации мелкозернистых материалов рассматривались в [17][18][19].…”