Journal
PHILOSOPHICAL MAGAZINE
Volume 93, Issue 23, Pages 3142-3153Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786435.2013.805271
Keywords
work hardening; strengthening mechanisms; aluminium alloys; modelling; Bauschinger effect
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Funding
- Research Council of Norway
- Sapa Technology under the MOREAL project
- Hydro
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The influence of dispersoids on tensile deformation behaviour has been studied by comparison of aluminium alloys containing different dispersoid densities. It was found that a fine dispersion of non-shearable particles led to an increased work hardening at the initial plastic deformation, but the effect was opposite at higher strains. The reason has been attributed to the generation of geometrically necessary dislocations (GNDs). A new model has been proposed for the evolution of GNDs based on a balance of storage and dynamic recovery of GNDs. The model predicts a rapid saturation of GNDs and a reduced work hardening at small strains, consistent with the experimental results.
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