A deformation mechanism map for polycrystals modeled using strain gradient plasticity and interfaces that slide and separate

Small scale strain gradient plasticity is coupled with a model of grain boundaries that take into account the energetic state of a plastically strained boundary and the slip and separation between neighboring grains. A microstructure of hexagonal grains is investigated using a plane strain finite el...

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Bibliographic Details
Published in:International journal of plasticity 2013-04, Vol.43, p.177-195
Main Authors: Dahlberg, Carl F.O., Faleskog, Jonas, Niordson, Christian F., Legarth, Brian Nyvang
Format: Article
Language:English
Subjects:
Deformation mechanisms
Grain boundaries
Grain boundary sliding
Grains
Mathematical models
Microstructure
Plasticity
Separation
Size-effects
Strain
Strain gradient plasticity
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Summary:Small scale strain gradient plasticity is coupled with a model of grain boundaries that take into account the energetic state of a plastically strained boundary and the slip and separation between neighboring grains. A microstructure of hexagonal grains is investigated using a plane strain finite element model. The results show that three different microstructural deformation mechanisms can be identified. The standard plasticity case in which the material behaves as expected from coarse grained experiments, the nonlocal plasticity region where size of the microstructure compared to some intrinsic length scale enhances the yield stress and a third mechanism, active only in very fine grained microstructures, where the grains deform mainly in relative sliding and separation.
ISSN:0749-6419
1879-2154
1879-2154
DOI:10.1016/j.ijplas.2012.11.010