|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Deformation and Transitions at Interfaces
||New Insights into Plasticity at Grain Boundaries by Nano- and Micromechanics
||Christoph Kirchlechner, Nataliya Malyar, Nicolas Peter, Gerhard Dehm
|On-Site Speaker (Planned)
Nano- and micromechanical testing on focused ion beam (FIB) milled pillars is frequently used to study size effects in materials. It also allows for isolating the effect of individual interfaces, like grain- or phase-boundaries on the strength.
Our current work focusses on slip transfer mechanisms and its dependence on (i) grain boundary (GB) type, (ii) loading direction and (iii) atomistic structure at the interface. In situ methods are applied to investigate the transfer from individual dislocations through the GB (via TEM), the collective storage (via µLaue diffraction) and collective transmission behavior (via SEM). In the talk, we comprehensively present first results on slip transfer in copper bi-crystals. Four different GB types, all made from copper, will be presented and discussed: (i) High Angle GBs (HAGBs) acting as strong obstacle for dislocation slip transfer; (ii) HAGBs allowing for easy slip transfer, (iii) coherent 3 twin-boundaries and (iv) coherent 5 GBs.