Dynamic strain aging: A coupled dislocation-Solute dynamic model

C. Fressengeas; A. J. Beaudoin; M. Lebyodkin; L. P. Kubin; Y. Estrin

doi:10.1016/j.msea.2005.02.073

Dynamic strain aging: A coupled dislocation-Solute dynamic model

C. Fressengeas, A. J. Beaudoin, M. Lebyodkin, L. P. Kubin, Y. Estrin

Mechanical Science and Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English (US)
Pages (from-to)	226-230
Number of pages	5
Journal	Materials Science and Engineering: A
Volume	400-401
Issue number	1-2 SUPPL.
DOIs	https://doi.org/10.1016/j.msea.2005.02.073
State	Published - Jul 25 2005

Keywords

Dynamic strain aging
Portevin-Le Chatelier (PLC)
Solute dynamic model

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Online availability

10.1016/j.msea.2005.02.073

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title = "Dynamic strain aging: A coupled dislocation-Solute dynamic model",

abstract = "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.",

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TY - JOUR

T1 - Dynamic strain aging

T2 - A coupled dislocation-Solute dynamic model

AU - Fressengeas, C.

AU - Beaudoin, A. J.

AU - Lebyodkin, M.

AU - Kubin, L. P.

AU - Estrin, Y.

PY - 2005/7/25

Y1 - 2005/7/25

N2 - 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.

AB - 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.

KW - Dynamic strain aging

KW - Portevin-Le Chatelier (PLC)

KW - Solute dynamic model

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JO - Materials Science and Engineering: A

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IS - 1-2 SUPPL.

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Dynamic strain aging: A coupled dislocation-Solute dynamic model

Abstract

Keywords

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