Disclinations and rotational deformation in fine-grained materials

被引：35

作者：

Gutkin, MY ^{[1
]}

Kolesnikova, AL ^{[1
]}

Ovid'ko, IA ^{[1
]}

Skiba, NV ^{[1
]}

机构：

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

来源：

PHILOSOPHICAL MAGAZINE LETTERS | 2002年 / 82卷 / 12期

基金：

俄罗斯基础研究基金会;

关键词：

D O I：

10.1080/0950083021000036742

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A theoretical model is presented which describes a new mechanism of plastic deformation in fine-grained materials. In the framework of the model, rotational deformation occurs via motion of dipoles of grain-boundary disclinations and is associated with the emission of lattice dislocations from grain boundaries into adjacent grain interiors. Ranges of defect system parameters are identified in which the disclination motion is energetically favourable. It is shown that the mechanism can contribute to plastic flow in fine-grained materials prepared by highly non-equilibrium methods such as ball milling, severe deformation and high-pressure compaction.

引用

页码：651 / 657

页数：7

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