Thickening of deformation-distorted high-angle grain boundaries in nanomaterials

被引：0

作者：

S. V. Bobylev

I. A. Ovid’ko

机构：

[1] St. Petersburg State Polytechnic University,Research Laboratory “Mechanics of New Nanomaterials,”

[2] Russian Academy of Sciences,Institute of Problems of Mechanical Engineering

[3] St. Petersburg State University,undefined

来源：

Physics of the Solid State | 2015年 / 57卷

关键词：

Structural Unit; Burger Vector; High Angle; Misorientation Angle; Lattice Dislocation;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

A theoretical model describing deformation-distorted (nonequilibrium) high-angle grain boundaries in nanocrystalline and ultrafine-grained materials has been proposed. Within this model, the dislocation structure of the distorted high-angle grain boundaries has been considered as a combination of the standard wall of grain-boundary dislocations and lattice dislocations (nonequilibrium dislocations) trapped from the adjacent grains. The energy characteristics of a system of grain-boundary defects have been calculated. It has been shown that the thickening of a grain boundary due to the coordinated motion of nonequilibrium dislocations is an energetically favorable and barrierless process. The dependences of the thickening on different parameters of the problem have been investigated. Typical values of the thickening are equal to 1.5–2.5 nm, which agrees with the available experimental data.

引用

页码：2059 / 2065

页数：6