Regensburg 2022 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 30: Liquid and Amorphous Metals
MM 30.8: Talk
Thursday, September 8, 2022, 12:15–12:30, H46
Tracer diffusion of Fe and Zr in CuZr nanoglasses — •Christian Aaron Rigoni1, Hendrik Voigt1, Evgeniy Boltynjuk2, Bonnie Tyler3, Sergiy Divinski1, Horst Hahn2, and Gerhard Wilde1 — 1Institute of Materials Physics, University of Münster, Germany — 2Institute of Nanotechnology, Karlsruhe Institute of Technology, Germany — 3Physikalisches Institut, University of Münster, Germany
Metallic nanoglasses consist of nanometer-sized amorphous regions separated by amorphous interfaces. According to the current knowledge, the amorphous structure of these interfaces is different from that of the amorphous grains. This rather new class of material shows a different behaviour in comparison to conventional homogenous metallic glasses, e.g. a reduced density, a reduced number of nearest neighbor atoms, a different electronic structure, an increase in the ferromagnetic transition temperature and an increased thermal stability were reported. In the present work, tracer diffusion in CuZr nanoglasses and their homogenous amorphous counterparts is measured. For the investigation, a radiotracer technique via ion beam sputtering (89Zr and 55Fe radioisotopes) is applied as well as SIMS profiling using stable isotopes. The tracer diffusion measurements are demonstrated to represent a specific and sensitive probe of the structure modifications, and the results are compared to the observations made by TEM and APT.