Special rotational deformation in nanocrystalline metals and ceramics

被引：54
|
作者：
Ovid'ko, I. A. [1 ]
Sheinerman, A. G. [1 ]
机构：
[1] Russian Acad Sci, Inst Problems Mech Engn, St Petersburg 199178, Russia
来源：
SCRIPTA MATERIALIA | 2008年 / 59卷 / 01期
基金：
俄罗斯基础研究基金会; 美国国家科学基金会;
关键词：
rotational deformation; plastic deformation; nanocrystalline materials; disclinations;
D O I：
10.1016/j.scriptamat.2008.02.047
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A model is suggested which describes a special mechanism for rotational deformation (plastic deformation accompanied by crystal lattice rotation) in nanocrystalline metals and ceramics. Within the model, the special rotational deformation occurs in a nano-grain through formation of immobile disclinations whose strengths gradually increase during the formation process as a result of grain boundary sliding and diffusion. The conditions are calculated at which the special rotational deformation is energetically favorable in nanocrystalline Ni, alpha-Al2O3 (corundum) and TiN-based ceramics. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：119 / 122
页数：4
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