Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 48: Topical session: Dynamics, relaxation and deformation in deeply supercooled metallic liquids and glasses III - plasticity and hetererogeneities

MM 48.4: Vortrag

Mittwoch, 22. März 2017, 16:45–17:00, IFW A

Deformation and relaxation of AlYFe metallic glass ribbons — •Marius Gerlitz, Rene Hubek, Martin Peterlechner, and Gerhard Wilde — Institute of Materials Physics, University of Münster, Germany

Metallic glasses and their deformation behavior are in the focus of current research. Plastic deformation of amorphous structures causes localized shear zones, so called shear bands. However, it is not fully understood to which extend the matrix carries deformation and alters its characteristics upon plastic deformation. Inherent thermal vibrations of atoms are sensitive to their mechanical coupling, thus, specific heat measurements at low temperatures are an excellent tool to analyze fundamental properties of vibrational modes. In the present work, an AlYFe glass was chosen as a model system to analyze the influence of deformation on excess contributions to the specific heat at low temperatures, known as Boson peak. Specimen-states were examined including heat capacity measurements via a 2-Tau-Method subsequent to characterization through x-ray-diffraction and calorimetric measurements. Results are discussed in comparison to the available literature on the Boson peak of metallic glasses. Specifically it was found that the relaxation behavior of metallic glasses is enhanced by the presence of shear bands. Due to the limited volume of shear bands, it is concluded that the mostly undeformed matrix additionally contributes to the relaxation.