Regensburg 2010 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 6: Diffusion and Point Defects II
MM 6.2: Vortrag
Montag, 22. März 2010, 11:45–12:00, H6
Self-diffusion of Ti and ultra fast solute diffusion of Co in annealed and severely deformed α-Ti — •Jochen Fiebig1, Sergiy Divinski1, Yuri Estrin2, and Gerhard Wilde1 — 1Institute of Material Physics, Westfälische Wilhelms University, Wilhelm-Klemm-Str. 10, 48149 Münster — 2Monash University, Claytoon, Victoria, Australia
Severely deformed materials attain nowadays a growing technological interest due to their advanced properties and property combination. In the present study we compared the diffusion properties, especially grain boundary diffusion, of coarse-grained and ultra fine-grained α-Ti. The severe deformation was performed by equal channel angular pressing. The radiotracer method was used in combination with the parallel sectioning technique. With this method we studied the self-diffusion of 44Ti and the impurity diffusion of the so called ’fast diffuser’ 57Co in α-Ti before and after severe plastic deformation. For 57Co ultra-fast diffusion rate along the grain boundaries in annealed α-Ti was observed which is significantly decreased after severe plastic deformation. The diffusion data is discussed with respect to the possible existence of ’non-equilibrium’ grain boundaries in severely deformed materials. Support by DFG is gratefully acknowledged.