Characterization of plastically deformed metals by 3D high resolution electron backscatter diffraction (HR-EBSD) at the micron scale
Understanding plastic deformation in confined volume is one of the big challenges of modern micromechanics studies. Dislocation nucleation, mobility and accumulation have complex behaviour that is affected by the long-range stresses appearing in the crystal lattice during deformation. Furthermore, plastic deformation depends on the temperature, volume and geometry of the deformed sample. Recently, a lot of effort has been undertaken to understand micromechanical processes at the sub-micron scale. Our aim is to understand size, strain rate and temperature effects in single crystalline micropillars, microcantilevers and microtensile samples.
The application of high angular resolution electron backscatter diffraction (HR-EBSD) combined with serial slicing by focused ion beam (FIB) offers a unique characterization technique to map residual strains, stresses and plastic deformation in 3 dimensions. We apply 3D HR-EBSD to reconstruct the distribution of geometrically necessary dislocations (GNDs) to study their distribution. Our 3D models show remarkable details in the distribution of GNDs at different deformation conditions. Characterizing plastic deformation with this novel method offer new possibilities to better understand the mechanisms of deformation at small scale.
Dr. Szilvia Kalácska
Empa
Feuerwerkerstrasse 39
CH-3602 Thun
Switzerland
| Phone | +41 58 765 6263 |
| Dr. Szilvia Kalácska | |
| Http | Dr, Szilvia Kalácska |
| Mechanics of Materials and Nanostructures |