Plastic deformation behaviour of fine-grained materials

被引：309
|
作者：
Kim, HS [1 ]
Estrin, Y [1 ]
Bush, MB [1 ]
机构：
[1] Univ Western Australia, Dept Mech & Mat Engn, Nedlands, WA 6907, Australia
来源：
ACTA MATERIALIA | 2000年 / 48卷 / 02期
基金：
澳大利亚研究理事会;
关键词：
nanocrystalline materials; constitutive equations; bulk diffusion; interface diffusion; copper;
D O I：
10.1016/S1359-6454(99)00353-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A phase mixture model in which a polycrystalline material is regarded as a mixture of a crystalline phase and a grain-boundary phase is presented. The model aims to describe the plastic deformation behaviour of fine-grained materials. The mechanical properties of the crystalline phase are modelled using unified viscoplastic constitutive relations, which take dislocation density evolution and diffusion creep into account. The total strain rate of a crystallite is calculated by summation of the contributions of dislocation, boundary diffusion and lattice diffusion mechanisms. The deformation mechanism for the grain-boundary phase is modelled as a diffusional flow of matter through the grain boundary. Using a simple rule of mixtures, the grain size dependence of the overall plastic deformation behaviour of the material is analysed. Rate effects are also investigated. The results of the calculations are compared with previously published experimental data. (C) 2000 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：493 / 504
页数：12
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