Description of creep with allowance for dislocation multiplication and transformations

The previously developed approach to the description of plastic deformation is applied in this work to an analysis of creep. Plastic deformation is considered as the evolution of a dislocation ensemble including dislocation transformations and processes of generation and annihilation of dislocations...

Full description

Saved in:
Bibliographic Details
Published in:Physics of metals and metallography 2006-03, Vol.101 (3), p.231-241
Main Authors: Ivanov, M. A., Greenberg, B. A.
Format: Article
Language:English
Subjects:
Creep (materials)
Density
Dislocation density
Dislocations
Evolution
Plastic deformation
Time dependence
Transformations
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The previously developed approach to the description of plastic deformation is applied in this work to an analysis of creep. Plastic deformation is considered as the evolution of a dislocation ensemble including dislocation transformations and processes of generation and annihilation of dislocations. On the assumption of a spatially uniform distribution of dislocations, we obtained a set of first-order differential equations that describe the time dependence of the amount of plastic deformation and the densities of dislocations of various types. It is shown that the approach developed permits one to describe the entire evolution of the time dependence of deformation, including various stages of creep and transitions between them. We also analyze how the shape of creep curves is affected by changes in the parameters that characterize dislocation transformations and the operation of dislocation sources.[PUBLICATION ABSTRACT]
ISSN:0031-918X
1555-6190
DOI:10.1134/S0031918X06030057