Berlin 2018 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 22: Microstructure and Phase Transformations

MM 22.3: Vortrag

Dienstag, 13. März 2018, 10:45–11:00, TC 010

Hall-Petch relations of Cu-Ni alloys and their dependence on severe deformation and annealing — •Friederike Emeis, Martin Peterlechner, and Gerhard Wilde — Institute of Materials Physics, Westfälische Wilhelms-Universität Münster, D-48149

The Hall-Petch relationship is widely discussed and used as a microstructural description of different materials. In this talk the existence of different Hall-Petch relationships for the same materials, processed in different ways to achieve a variation of their grain sizes and structures is shown and connected to grain boundary characteristics. Pure Cu and Ni as well as four different compositions of Cu-Ni alloys are processed by severe plastic deformation at room temperature up to different strain levels (unsaturated and saturated severely deformed) and subsequent annealed. It is shown, that the processing and thus the characteristics of grain boundaries have in general the same effect on different materials. Furthermore, the saturated severely deformed microstructure is well described by a polycrystalline Hall-Petch relationship. It is concluded that dynamic recovery and recrystallization change the microstructure in a way that the influence of the grain boundaries on the hardness is as dominant as in a relaxed microstructure.