Berlin 2012 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 40: Topical Session Bulk Nanostrucured Materials IX - Functional Properties II

MM 40.3: Vortrag

Mittwoch, 28. März 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.