Statistical behaviour and strain localization patterns in the Portevin-Le Chatelier effect

被引:112
作者
Lebyodkin, M
Brechet, Y
Estrin, Y
Kubin, L
机构
[1] INST NATL POLYTECH GRENOBLE, THERMODYNAM & PHYSICOCHIM MET LAB, F-38402 ST MARTIN DHERES, FRANCE
[2] UNIV WESTERN AUSTRALIA, DEPT MECH & MAT ENGN, NEDLANDS, WA 6907, AUSTRALIA
[3] OFF NATL ETUD & RECH AEROSP, OM, CNRS, LAB ETUD MICROSTRUCT, F-92322 CHATILLON, FRANCE
关键词
D O I
10.1016/1359-6454(96)00076-6
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Statistics of the stress drops associated with the Portevin-Le Chatelier effect in an Al-Mg alloy were studied both experimentally and theoretically. II was shown that the character of the statistics changes from a peaked distribution of the stress drop magnitudes to a monotonically decreasing one as the imposed strain rate or the temperature are increased. A discrete mode: based on a micromechanically founded local constitutive equation combined with spatial coupling between the elements of the system was shown to reproduce the observed statistical behaviour. The mechanism of spatial coupling is connected with elastic stresses due to local plastic incompatibilities. The model was Further applied to simulate spatial deformation patterns including propagative deformation bands. The systematics of the bands reported in the literature as well as the observed dependence of the band velocity on the imposed deformation rate were recovered. It was concluded that the model proposed provides an adequate description of both the statistics of stress discontinuities and the spatial features of the Portevin-Le Chatelier effect. Copyright (C) 1996 Acta Metallurgica Inc.
引用
收藏
页码:4531 / 4541
页数:11
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