Incipient Bulk Polycrystal Plasticity Observed by Synchrotron In-Situ Topotomography
Résumé
In this paper, we present a comprehensive 4D study of the early stage of plastic deformation in a polycrystalline binary AlLi alloy. The entire microstructure is mapped with X-ray diffraction contrast tomography, and a set of bulk grains is further studied via X-ray topotomography during mechanical loading. The observed contrast is analyzed with respect to the slip system activation, and the evolution of the orientation spread is measured as a function of applied strain. The experimental observations are augmented by the mechanical response predicted by crystal plasticity finite element simulations to analyze the onset of plasticity in detail. Simulation results show a general agreement of the individual slip system activation during loading and that comparison with experiments at the length scale of the grains may be used to fine tune the constitutive model parameters.Dataset 10.5281/zenodo.1412401
Mots clés
Finite element method
X-ray diffraction imaging
Aluminum alloys
Binary alloys
Chemical activation
Lithium alloys
Polycrystalline materials
Polycrystals
Thermal barrier coatings
X ray diffraction
Finite element simulations
In-situ experiments
Lattice curvature
Polycrystal plasticity
Rocking curves
Topotomography
X-RAY-DIFFRACTION
DIGITAL IMAGE CORRELATION
SINGLE-CRYSTALS
CONSTITUTIVE LAWS
MATERIALS SCIENCE
FINITE-ELEMENTS
MICROSCOPY
IDENTIFICATION
DEFORMATION
SCALE
Domaines
Sciences du Vivant [q-bio]
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