Chain decay of low-angle tilt boundaries in nanocrystalline materials

被引：16

作者：

Bobylev, SV ^{[1
]}

Gutkin, MY ^{[1
]}

Ovid'ko, IA ^{[1
]}

机构：

[1] Russian Acad Sci, Inst Problems Mec Engn, St Petersburg 199178, Russia

来源：

PHYSICS OF THE SOLID STATE | 2004年 / 46卷 / 11期

基金：

俄罗斯基础研究基金会;

关键词：

D O I：

10.1134/1.1825548

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

In terms of two-dimensional dislocation-disclination dynamics, a theoretical model is developed to describe the decay of a low-angle tilt boundary in a deformed nanocrystalline material under the action of an externally applied elastic stress and of the elastic field of a neighboring decayed boundary. The critical external stresses are calculated at which the boundary decays and the dislocations making up this boundary either are trapped by the boundary that decayed earlier or break away from both boundaries. The decay of a low-angle tilt boundary is shown to result in a substantial decrease in the critical decay stresses for the neighboring boundaries, which can cause an avalanche-like chain decay of low-angle boundaries yielding high-density ensembles of mobile dislocations capable of carrying substantial plastic deformations and of forming shear bands in deformed nanocrystalline materials. (C) 2004 MAIK "Nauka/Interperiodica".

引用

页码：2053 / 2057

页数：5

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