Modelling and Measurement of Plastic Deformation and Grain Rotation in 3D at the Grain-to-Grain Level

The deformation of a polycrystalline sample of aluminium at the microstructural scale was stud-ied by a combination of computational modelling and synchrotron X-ray diffraction contrast to-mography (DCT). DCT was used to map the 3D grain arrangement in a polycrystal. This was the basis of a microstructurally faithful mesh for crystal plasticity finite element modelling (CPFEM). The sample was then monitored by DCT during incremental uniaxial compression. Changes in the diffracted spots during deformation were interpreted in terms or crystal re-orientation and orientation spread within grains. Reorientation within grains of ~±1° has been observed after 1.2% compressive strain and alongside considerable grain-to-grain variation in reorientation relative to that expected according to simple crystal plasticity models. The CPFEM results showed similar grain-to-grain variations, indicating that the local geometry is important in determining the level of heterogeneity in deformation at this scale. However, on a grain-to-grain basis, agreement is relatively poor. Possible reasons for the observed differences are discussed.

GONZALEZ David;  KING Andrew;  SIMONOVSKI Igor;  QUINTA DA FONSECA Joao;  WITHERS Philip J.; 

2011-11-17

John Wiley & Sons, Inc.

JRC64450

http://books.google.it/books?hl=it&lr=&id=_lsX4IEHofQC&oi=fnd&pg=PA107&dq=Modelling,    and,    Measurement,    of,    Plastic,    Deformation,    and,    Grain,    Rotation,    in,    3D,    at,    the,    Grain-to-Grain,    Level&ots=YFpbxnoUjx&sig=3TEluLXOio4TwNYrB5VxO0D_H0c#v=onepage&q=Modelling%20and%20Me,    https://publications.jrc.ec.europa.eu/repository/handle/JRC64450,