Dresden 2011 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 8: Liquid and Amorphous Metals II

MM 8.1: Talk

Monday, March 14, 2011, 14:30–14:45, IFW D

First measurements of the diffusion coefficient in shear bands — •Joachim Bokeloh, Sergiy Divinskiy, Gerrit Reglitz, and Gerhard Wilde — Institut für Materialphysik, WWU Münster

Although the occurrence of shear bands during plastic deformation of metallic glasses was discovered early on and in spite of the extensive research done on the formation of shear bands and their behaviour during plastic deformation, they remain a fairly unknown entity. A key factor in this is the difficulty in accessing the actual physical properties of the shear bands. This is reflected in the very limited number of publications that report experimental data on shear band properties as opposed to the large number of publications that approach shear bands from simulation. In this presentation, experimental data on the diffusion in shear bands has been obtained using the radiotracer method that is conventionally utilized for determining grain boundary diffusion coefficients. Utilizing the tracer method on the post-deformed specimen serves analysing a lower bound of the diffusivity that was present during the shear band formation, i.e. during plastic deformation. Yet, the experimental results indicate unambiguously that even in the post-deformation state the diffusivity is largely enhanced as compared to the volume diffusion in metallic glasses.