ICAMS / Interdisciplinary Centre for Advanced Materials Simulation

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Deformation pattern of a Ni-base single-crystalline superalloy in Vickers indentation: crystal plasticity simulation versus experiment

Date: 18.08.2009
Place: International Conference on the Strength of Materials, Dresden, Germany

Bernhard Eidel
Alexander Hartmaier

Abstract Pyramidal indentation into the (001) surface of an fcc single crystal made of a Ni-base superalloy exhibits indent shapes which strongly depend on the azimuthal orientation of the indenter. This contribution experimentally elucidates this observation by 3d digital surface models obtained from high resolution electron back-scatter diffraction (EBSD) technique along with digital image processing. Simulation results of a crystal plasticity finite element analysis are in very good agreement with the experimental observations; the results suggest that the driving mechanism for the observed pile-up formation in indentation is purely crystallographic slip geometry, whereas the influence of stress concentrations due to (i) different indenter orientations, due to (ii) different indenter shapes and even due to (iii) the anisotropy in the elasticity law is negligible.

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