Dresden 2014 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 31: Mechanical properties II - Characterisation mechanics
MM 31.4: Vortrag
Dienstag, 1. April 2014, 16:30–16:45, IFW D
Energetic Structure of micro Laue Peaks from Plastically-Deformed Cu Micro-Beam Revealed by a Three-Dimensional X-ray Detector — •Ali Abboud1, Christoph Kirchlechner2, Lothar Strüder3, Jozef Keckes4, and Ullrich Pietsch1 — 1University of Siegen FKP — 2Max Planck Institut für Eisenforschung GmbH — 3PNSensor GmbH — 4Material Center Leoben Forschungs GmbH
Energy dispersive micro-Laue diffraction is used to analyse morphology and energetic structure of circular and streaked Cu 711 and 511 reflections collected during a position-resolved experiment on a plastically deformed Cu micro-beam with dimension of 6 x 6 x 30 um^3. The synchrotron experiment was performed at the BM32 beam line of ESRF using polychromatic radiation of 5-27keV and beam size of 0.5x0.5 um^2. The diffraction signal was recorded using an energy-dispersive two dimensional detector; pnCCD. Whereas the Laue reflections obtained from undeformed sample regions remain sharp and diffract at distinct X-ray energies, streaked reflections originating from plastically deformed regions possess an energy gradient which is interpreted by lattice rotation caused by geometrically necessary dislocations stored in the crystal. The novel approach represents a milestone in the structural analysis of materials and will be used to analyse (i) strains in elastically deformed samples without the need of sample rotation and (ii) dislocation structures as well as local strains in plastically deformed metals.