Regensburg 2016 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 28: Topical session: In-situ Microscopy with Electrons, X-Rays and Scanning Probes in Materials Science II - Atomic structure and defects I

MM 28.4: Vortrag

Mittwoch, 9. März 2016, 11:15–11:30, H38

Microstructural Evolution in severely deformed Cu-Ni alloys — •Friederike Emeis, Yulia Buranova, Vitalij Schmidt, Jörn Leuthold, Harald Rösner, and Gerhard Wilde — Institute of Materials Physics, Westfälische Wilhelms-Universität Münster, D-48149

The microstructure evolution of Cu-Ni alloys with different compositions was investigated after severe plastic deformation using high pressure torsion (HPT) with different number of turns followed by annealing. The microstructure evolution is influenced by the stacking fault energy (SFE), which indicates how easily dislocations can form and, therefore, how likely a material is to undergo twinning. The SFEs of the different compositions were experimentally determined by the dissociation width of the present dislocation using high resolution transmission electron microscopy. Twin grain boundaries and especially their conjunction to Σ3-Σ3-Σ9-triple junctions are expected to give more thermal stability to materials. The presence of twins (especially nano-scale twins) was analyzed and grain boundary distributions, grain size distributions and hardness were characterized using electron backscatter diffraction (EBSD), TEM and Vickers Hardness measurements. The obtained results are discussed concerning the impact of the SFE on microstructure evolution during severe plastic deformation.