Berlin 2012 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 40: Topical Session Bulk Nanostrucured Materials IX - Functional Properties II
MM 40.3: Talk
Wednesday, March 28, 2012, 17:00–17:15, H 0106
Diffusion in α-titanium after severe plastic deformation — •Jochen Fiebig1, Sergiy Divinski1, Yuri Estrin2, Ruslan Valiev3, and Gerhard Wilde1 — 1Institute of Materials Physics, Westfälische Wilhelms University of Münster, Wilhelm-Klemm-Str. 10, 48149 Münster — 2Institute of Physics of Advance Materials, Ufa State Aviation University, 12 K. Marx Street 450000 Ufa, Russian Federation — 3Department of Materials Engineering, Monash University, Clayton, Victoria 3800, Australia
In the present study we focus on the diffusion and mechanical properties of severely deformed α-titanium produced by equal channel angular pressing (ECAP), including continuous ECAP, and high-pressure torsion. The radiotracer method in combination with parallel sectioning was used to study the self-diffusion (44Ti radioisotope) and solute diffusion of silver (110mAg radioisotope). The diffusion data were analyzed with regard to the different production methods of ultrafine grained Ti and their potential for generating a special, "non-equilibrium" state of general high-angle grain boundaries. Such interfaces should exhibit a higher diffusivity than general high-angle grain boundaries in coarse grained Ti. The microhardness and its variation with temperature were measured to analyze the stability of the microstructure of the material. The microstructure was studied by TEM and SEM analyses, including EBSD measurements.