Transformations of grain boundary dislocation pile-ups in nano- and polycrystalline materials

被引：110

作者：

Fedorov, AA ^{[1
]}

Gutkin, MY ^{[1
]}

Ovid'ko, IA ^{[1
]}

机构：

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

来源：

ACTA MATERIALIA | 2003年 / 51卷 / 04期

关键词：

deformation; grain boundaries; dislocations; nanostructures;

D O I：

10.1016/S1359-6454(02)00433-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A theoretical model is suggested which describes several types of transformations of grain boundary dislocation pileups at triple junctions of grain boundaries in (super) plastically deformed nanocrystalline and polycrystalline materials. Ranges of parameters of defect configurations are revealed at which the transformations considered are energetically favourable. The role of transformations of grain boundary dislocation pile-ups at triple junctions of grain boundaries in plastic deformation processes in nanocrystalline and polycrystalline materials is discussed with special attention being paid to the influence of such transformations on competition between different deformation mechanisms in nanocrystalline materials. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：887 / 898

页数：12

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