Анализ упруго-напряженного состояния границ нанокристаллов в рамках дисклинационного подхода

Abstract

The results of a theoretical analysis of the elastic-stressed state and the distribution of elastic energy in nanostructured metallic materials in the vicinity of nanograin boundaries with a high density of partial disclinations are presented. The features of the distribution of the stress fields of disclinational grain-boundary configurations as a function of the size of nanograins are determined taking into account the superposition of these stresses during the screening of disclination pile-ups. It's found that the maximum values of the main components of the stress tensor are achieved only in the disclination planes 25, and the gradients of these stresses are characterized by the maximum values at the nodal points. It's shown that the local energy maxima are a characteristic feature of the distribution of the specific elastic energy of these configurations, which can be the cause of the physical broadening of the nanograin boundaries.