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Modeling of continuous dynamic recrystallization in commercial-purity aluminum

Hallberg, Håkan LU ; Wallin, Mathias LU and Ristinmaa, Matti LU (2010) In Materials Science & Engineering: A 527(4-5). p.1126-1134
Abstract
A constitutive model for polycrystalline metals is established within a micromechanical framework. The inelastic deformation is defined by the formation and annihilation of dislocations together with grain refinement due to continuous dynamic recrystallization. The recrystallization studied here occurs due to plastic deformation without the aid of elevated temperatures. The grain refinement also influences the evolution of the dislocation density since the recrystallization introduces a dynamic recovery as well as additional grain and subgrain boundaries, hindering the movement of dislocations through the material microstructure. In addition, motivated by experimental evidence, the rate dependence of the material is allowed to depend on... (More)
A constitutive model for polycrystalline metals is established within a micromechanical framework. The inelastic deformation is defined by the formation and annihilation of dislocations together with grain refinement due to continuous dynamic recrystallization. The recrystallization studied here occurs due to plastic deformation without the aid of elevated temperatures. The grain refinement also influences the evolution of the dislocation density since the recrystallization introduces a dynamic recovery as well as additional grain and subgrain boundaries, hindering the movement of dislocations through the material microstructure. In addition, motivated by experimental evidence, the rate dependence of the material is allowed to depend on the grain size. Introducing a varying grain size into the evolution of the dislocation density and in the rate dependence of the plastic deformation are believed to be important and novel features of the present model. The proposed constitutive model is implemented in a numerical scheme allowing calibration against experimental results, which is shown using commercial-purity aluminum as example material. The model is also employed in macroscale simulations of grain refinement in this material during extensive inelastic deformation. (C) 2009 Elsevier B.V. All rights reserved. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
pressing, Equal channel angular, ECAP, Recrystallization, Viscoplasticity, Aluminum, AA1050
in
Materials Science & Engineering: A
volume
527
issue
4-5
pages
1126 - 1134
publisher
Elsevier
external identifiers
  • wos:000273983900039
  • scopus:72249120865
ISSN
1873-4936
DOI
10.1016/j.msea.2009.09.043
language
English
LU publication?
yes
id
d6321408-44f3-4600-b32f-19ab672f9695 (old id 1546918)
date added to LUP
2010-02-25 11:04:40
date last changed
2018-07-01 03:03:48
@article{d6321408-44f3-4600-b32f-19ab672f9695,
  abstract     = {A constitutive model for polycrystalline metals is established within a micromechanical framework. The inelastic deformation is defined by the formation and annihilation of dislocations together with grain refinement due to continuous dynamic recrystallization. The recrystallization studied here occurs due to plastic deformation without the aid of elevated temperatures. The grain refinement also influences the evolution of the dislocation density since the recrystallization introduces a dynamic recovery as well as additional grain and subgrain boundaries, hindering the movement of dislocations through the material microstructure. In addition, motivated by experimental evidence, the rate dependence of the material is allowed to depend on the grain size. Introducing a varying grain size into the evolution of the dislocation density and in the rate dependence of the plastic deformation are believed to be important and novel features of the present model. The proposed constitutive model is implemented in a numerical scheme allowing calibration against experimental results, which is shown using commercial-purity aluminum as example material. The model is also employed in macroscale simulations of grain refinement in this material during extensive inelastic deformation. (C) 2009 Elsevier B.V. All rights reserved.},
  author       = {Hallberg, Håkan and Wallin, Mathias and Ristinmaa, Matti},
  issn         = {1873-4936},
  keyword      = {pressing,Equal channel angular,ECAP,Recrystallization,Viscoplasticity,Aluminum,AA1050},
  language     = {eng},
  number       = {4-5},
  pages        = {1126--1134},
  publisher    = {Elsevier},
  series       = {Materials Science & Engineering: A},
  title        = {Modeling of continuous dynamic recrystallization in commercial-purity aluminum},
  url          = {http://dx.doi.org/10.1016/j.msea.2009.09.043},
  volume       = {527},
  year         = {2010},
}