Dynamic strain aging: A coupled dislocation-solute dynamic model

被引：109

作者：

Fressengeas, C ^{[1
]}

Beaudoin, AJ

Lebyodkin, M

Kubin, LP

Estrin, Y

机构：

[1] Univ Metz, CNRS, Mecan & Phys Mat Lab, F-57045 Metz, France

[2] Univ Illinois, Dept Mech & Ind Engn, Urbana, IL 61801 USA

[3] Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Moscow District, Russia

[4] Tech Univ Clausthal, Inst Werkstoffkunde & Werkstofftech, D-38678 Clausthal Zellerfeld, Germany

[5] Off Natl Etud & Rech Aerosp, CNRS, Lab Etude Microstruct, F-92322 Chatillon, France

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2005年 / 400卷

关键词：

dynamic strain aging; Portevin-Le Chatelier (PLC); solute dynamic model;

D O I：

10.1016/j.msea.2005.02.073

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A model for dynamic strain aging is proposed. It is written as a local constitutive formulation but can easily be extended to account for spatial interactions. The model is obtained by embedding accepted 'slow' time scale formulations for dislocation dynamics and aging kinetics in a multiple time scales dynamic system. Dislocation and solute dynamics are coupled at the 'fast' time scale pertaining to dynamic aging. Features of jerky flow described by standard models such as the negative strain rate sensitivity of the flow stress and critical strains for the occurrence of the Portevin-Le Chatelier effect are retrieved. In addition, negative strain rate sensitivity of the threshold stress for instability is predicted. (c) 2005 Published by Elsevier B.V.

引用

页码：226 / 230

页数：5

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