|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation
||Simulations of Bi-crystal Nanoindentation and Polycrystalline Uniaxial Tensile Deformation with a Grain Boundary-aware Crystal Plasticity Model
||Yang Su, Philip Eisenlohr, Thomas Bieler, Martin Crimp
|On-Site Speaker (Planned)
To learn how grain boundaries modulate plastic deformation of commercially pure titanium, conospherical nanoindentations were placed at preselected grain boundaries. The surface topography of each bi-crystal nanoindent was simulated using two alternative crystal plasticity finite element models, with or without independent grain boundary elements. Better matches between modeled and atomic force microscopy (AFM) measured indent topographies were achieved when the grain boundary-aware model was used. Both models were applied to uniaxial tensile deformation of a characterized polycrystalline microstructure (initial and final grain orientations and grain boundary network) and the simulated surface topography and crystal reorientation were compared to the experimental data. The observed differences between models were further analyzed with respect to the slip system activities and Cauchy stresses developed in the vicinity of the grain boundaries. This work was supported by NSF Grant DMR-1411102.
||Planned: Supplemental Proceedings volume