Dresden 2006 – wissenschaftliches Programm
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MM: Metall- und Materialphysik
MM 34: Symposium Materials Modelling III
MM 34.4: Vortrag
Donnerstag, 30. März 2006, 17:45–18:00, IFW A
Three dimensional investigation of the texture and microstructure below a nanoindent in a Cu single crystal using 3D EBSD and crystal plasticity finite element simulations — •Nader Zaafarani1, Dierk Raabe1, RamNiwas Singh2, Franz Roters1, and Stefan Zaefferer1 — 1Max-Planck Institut für Eisenforschung, Max-Planck-Str. 1, 40237 Düsseldorf, Deutschland — 2Materials Science Division, Bhabha Atomic Research Centre, Mumbai-400085, India
This is a 3D study on the microstructure and texture below a conical nanoindent in a [111] Cu single crystal at a nanometer-scale resolution. The experiments are conducted by using a joint high-resolution field emission SEM-EBSD set-up coupled with serial sectioning in a focused ion beam (FIB) system in the form of a cross-beam 3D crystal orientation microscope (3D EBSD). The experiments (conducted in sets of subsequent (11-2) cross section planes) reveal a pronounced deformation-induced 3D patterning of the lattice rotations below the indent. In the cross section planes perpendicular to the (111) surface plane below the indenter tip the observed deformation-induced rotation pattern is characterized by an outer tangent zone with large absolute values of the rotations and an inner zone closer to the indenter axis with small rotations. The 3D crystal plasticity simulations compared with the experiments have predicted a similar pattern for the absolute orientation changes but they fail to predict the fine details of the rotation patterning with the frequent changes in sign observed in the experiment. Also the simulations over-emphasize the magnitude of the rotation field tangent to the indenter relative to that directly below the indenter tip.