Berlin 2005 – wissenschaftliches Programm
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M: Metallphysik
M 30: Symposium Tomographic Methods in Materials Research
M 30.3: Vortrag
Montag, 7. März 2005, 11:40–12:00, TU H1058
Investigation of orientation gradients around particles and their influence on particle stimulated nucleation in a hot rolled Fe3Al based alloy by applying 3D EBSD — •Joachim Konrad, Stefan Zaefferer, and Dierk Raabe — Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Str.1, 40237 Düsseldorf
The optimization of the mechanical properties of Fe3Al based alloys requires the increase of room temperature ductility and of high temperature strength. Both can be achieved, inter alia, by the addition of particles, for example of Laves phase. On the one hand these particles influence recrystallisation by particle stimulated nucleation (PSN) or inhibition of boundary movement. On the other hand particles lead to strengthening of the matrix at high temperatures.
The occurrence of PSN is correlated with the size and the mechanical properties of the precipitates. The larger the particles are and the harder they are compared to the matrix the larger the orientation gradients in the matrix around these particles become. 3D EBSD investigations by serial sectioning using a scanning focused ion beam - electron microscope (FIB-SEM) reveal the spatial distribution of the orientation gradients and their influence on the nucleation behaviour. Furthermore, the orientation gradients provide information on the active slip systems in these areas.