Dresden 2014 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 39: Liquid and Amorphous Metals I - Shearbands

MM 39.3: Vortrag

Mittwoch, 2. April 2014, 10:45–11:00, IFW A

Diffusion in shear bands of a Pd40Ni40P20 bulk metallic glass — •Isabelle Binkowski, Sergiy V. Divinski, and Gerhard Wilde — 1- Institut für Materialphysik, Universität Münster, Wilhelm-Klemm-Str. 10, D-48149 Münster, Germany

Bulk metallic glasses feature beneficial properties which are promising for applications, because of which they have received increasing attention. Metallic glasses exhibit mechanical properties such as high strength and hardness, however, this advantage is impeded by the fact that their plasticity appears to be extremely limited. The plastic deformation is localized in thin regions, called shear bands, with widths from 10nm to 50 nm, whose extension lead to catastrophic failure. Despite their obvious importance, there exist several open issues concerning the initiation, propagation, kinetics and general comprehension of shear banding. In the present study, the characteristics of shear bands in a Pd40Ni40P20 bulk metallic glass are investigated more precisely utilizing the radiotracer technique to measure atomic transport in shear bands. Additionally, combining these experimental results with calorimetric measurements should get insight into the time-dependence and the impact of structural changes on diffusion.