Abstract
AbstractDisclination is a line defect in which rotational symmetry is broken. Recently, such defects have been observed in nanostructured metals. Hence, disclinations can bring out the unique properties of nanostructured metals. This chapter shows two examples of disclination-mediated plastic phenomena observed in atomic simulations. The first one is the grain subdivision mechanism, which is related to the mobility of partial disclination under severe plastic deformation processes. The second one is a mechanism that improves the fracture toughness using the disclination shielding effect, which appears at grain boundaries after dislocation emission. These atomic simulations with the geometrical restrictions of boundary conditions showed the possibility of selecting a plastic deformation mode by designing structures, elements, and environments to obtain materials with excellent mechanical properties.
Funder
Ministry of Education, Culture, Sports, Science and Technology
Publisher
Springer Nature Singapore