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Characterization and micromechanical modelling of microstructural heterogeneity effects on ductile fracture of 6xxx aluminium alloys

Hannard, F.; Pardoen, T.; Maire, E.; Le Bourlot, Christophe; Mokso, R. LU and Simar, A. (2016) In Acta Materialia 103. p.558-572
Abstract

Ductile failure of three 6xxx serie aluminium alloys has been characterized and modelled for about thirty hardening conditions each. These alloys involve relatively similar composition and volume fraction of second phase particles. The tensile mechanical properties show the expected decrease of fracture strain with increasing strength but also major differences among the different alloys with a factor ten in terms of reduction of area at fracture between best and worst case. The origin of these differences is unraveled by detailed characterization of the void nucleation, growth and coalescence process involving in situ 3D microtomography. A cellular automaton model, involving a high number of particles with distributions of position,... (More)

Ductile failure of three 6xxx serie aluminium alloys has been characterized and modelled for about thirty hardening conditions each. These alloys involve relatively similar composition and volume fraction of second phase particles. The tensile mechanical properties show the expected decrease of fracture strain with increasing strength but also major differences among the different alloys with a factor ten in terms of reduction of area at fracture between best and worst case. The origin of these differences is unraveled by detailed characterization of the void nucleation, growth and coalescence process involving in situ 3D microtomography. A cellular automaton model, involving a high number of particles with distributions of position, sizes and void nucleation stress is developed to predict the fracture strain. Excellent predictions are obtained based on the same unique nucleation stress distribution versus particle size for the three alloys. The key element setting the fracture strain is the effect of particle size distribution and spatial distribution on the void nucleation and coalescence processes. The dependence of ductility on strength is properly captured as well.

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author
publishing date
type
Contribution to journal
publication status
published
keywords
Aluminium alloys, Cellular automaton model, Damage initiation, Intermetallics, X-ray tomography
in
Acta Materialia
volume
103
pages
15 pages
publisher
Elsevier
external identifiers
  • scopus:84946221622
ISSN
1359-6454
DOI
10.1016/j.actamat.2015.10.008
language
English
LU publication?
no
id
4f8ce12d-b931-4ab5-af36-5966bc3b7682
date added to LUP
2017-09-19 14:36:51
date last changed
2017-10-16 09:55:36
@article{4f8ce12d-b931-4ab5-af36-5966bc3b7682,
  abstract     = {<p>Ductile failure of three 6xxx serie aluminium alloys has been characterized and modelled for about thirty hardening conditions each. These alloys involve relatively similar composition and volume fraction of second phase particles. The tensile mechanical properties show the expected decrease of fracture strain with increasing strength but also major differences among the different alloys with a factor ten in terms of reduction of area at fracture between best and worst case. The origin of these differences is unraveled by detailed characterization of the void nucleation, growth and coalescence process involving in situ 3D microtomography. A cellular automaton model, involving a high number of particles with distributions of position, sizes and void nucleation stress is developed to predict the fracture strain. Excellent predictions are obtained based on the same unique nucleation stress distribution versus particle size for the three alloys. The key element setting the fracture strain is the effect of particle size distribution and spatial distribution on the void nucleation and coalescence processes. The dependence of ductility on strength is properly captured as well.</p>},
  author       = {Hannard, F. and Pardoen, T. and Maire, E. and Le Bourlot, Christophe and Mokso, R. and Simar, A.},
  issn         = {1359-6454},
  keyword      = {Aluminium alloys,Cellular automaton model,Damage initiation,Intermetallics,X-ray tomography},
  language     = {eng},
  month        = {01},
  pages        = {558--572},
  publisher    = {Elsevier},
  series       = {Acta Materialia},
  title        = {Characterization and micromechanical modelling of microstructural heterogeneity effects on ductile fracture of 6xxx aluminium alloys},
  url          = {http://dx.doi.org/10.1016/j.actamat.2015.10.008},
  volume       = {103},
  year         = {2016},
}