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MM: Fachverband Metall- und Materialphysik

MM 55: Nanomaterials - Nanocrystalline & Porous Materials II

MM 55.1: Vortrag

Donnerstag, 14. März 2013, 11:45–12:00, H25

Structural and thermodynamic properties of severely deformed nickel — •Daria Prokoshkina¹, Anna Moros¹, Vladimir Popov², Gerhard Wilde¹, and Sergiy Divinski¹ — ¹Institute of Materials Physics, University of Münster, Germany — ²Institute of Physics of Metals, Russian Academy of Science, Ekaterinburg, Russia

The effect of severe plastic deformation (SPD) on microstructure, thermodynamic and transport properties of Ni of 99.6 wt. % purity was investigated. The plastic deformation was realized via equal channel angular pressing (ECAP), high-pressure torsion (HPT) and by cold rolling (CR) to 80 %. The properties of ultrafine grained nickel prepared by room temperature deformation (ECAP, HPT, CR), warm deformation at 200°C (ECAP), and cold deformation at liquid nitrogen temperature (HPT) were compared. The influence of different deformation paths on the microstructure was studied by Scanning Electron Microscopy with Focused Ion Beam add-on. Differential Scanning Calorimetry was used to analyze the thermally induced defect recovery. Grain boundary diffusion measurements were used to characterize the kinetic properties of interfaces in deformed and annealed materials applying the radiotracer technique and the 63Ni radioisotope. The obtained results are discussed concerning the impact of the deformation pathway on the kinetic and microstructural properties.

Financial supports of German-Israel Foundation (GIF) through research Grant No: G-1037, Deutscher Forschungsgemeinschaft and Russian Foundation for Basic Research (grant No: 12-03-91331-NNIO) are acknowledged.