Regensburg 2016 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 33: Topical session: In-situ Microscopy with Electrons, X-Rays and Scanning Probes in Materials Science III - Atomic structure and defects II
MM 33.2: Vortrag
Mittwoch, 9. März 2016, 12:15–12:45, H38
X-ray microdiffraction Laue experiments to understand plasticity at interfaces — •Christoph Kirchlechner1,2, Nataliya Malyar1, Peter Imrich2, and Gerhard Dehm1 — 1Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany — 2University of Leoben, Leoben, Austria
The deformation behavior of metallic single crystals is size dependent, as shown by several studies during the last decade (Uchic et al. 2009, Greer and De Hosson 2011). Nevertheless, real structures exhibit different interfaces like grain, twin or phase boundaries. Due to the possibly higher stresses at the micron scale, the poor availability of dislocation sources and the importance of diffusion in small dimensions the mechanical behavior of samples containing interfaces can considerable differ from bulk material. In the talk we show the first in situ microdiffraction Laue compression experiments on micron sized, bi-crystalline samples. Three different grain-boundary types will be presented and discussed (i) Large Angle grain Boundaries (LAGBs) acting as strong obstacle for dislocation slip transfer; (ii) LAGBs allowing for easy slip transfer and (iii) coherent sigma3 twin-boundaries. The talk will focus on pile-up of dislocations at the boundary, slip transfer mechanisms, storage of dislocations and dislocation networks at the LAGB.