Spatio-temporal dynamics of the Portevin-Le Chatelier effect:: Experiment and modelling

被引：164

作者：

Lebyodkin, M

Dunin-Barkowskii, L

Bréchet, Y

Estrin, Y ^{[1
]}

Kubin, LP

机构：

[1] Univ Western Australia, Dept Mech & Mat Engn, Nedlands, WA 6907, Australia

[2] Off Natl Etud & Rech Aerosp, CNRS, LEM, F-92322 Chatillon, France

[3] Domaine Univ Grenoble, LTPCM, F-38402 St Martin Dheres, France

[4] Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Russia

来源：

ACTA MATERIALIA | 2000年 / 48卷 / 10期

基金：

俄罗斯基础研究基金会;

关键词：

aluminium alloys; Portevin-Le Chatelier effect; computer simulation; constitutive equations; spatial coupling;

D O I：

10.1016/S1359-6454(00)00067-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The temporal and spatial features of the Portevin-Le Chatelier plastic instabilities in single and polycrystals of A-Mg alloys were investigated systematically, with special emphasis being put on the character of the statistical distributions of the stress drops. The effect of strain rate, temperature and the microstructural state of the alloy was studied experimentally. It was shown that an experimentally accessible quantity, the flow stress, governs to a large extent the observed correlation between the variation of the type of serrations and of the stress drop distributions. Computer simulations of the Portevin-Le Chatelier effect were carried out using a simple spatial coupling model. It was demonstrated that the salient features of the complex spatio-temporal behaviour observed experimentally for different microstructural states are adequately reproduced by the model. A comparison between the experimental data and the simulation results suggests that the spatial coupling stems from plastic strain incompatibilities. (C) 2000 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：2529 / 2541

页数：13

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