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MM: Fachverband Metall- und Materialphysik
MM 18: Poster Session I
MM 18.32: Poster
Montag, 16. März 2020, 18:15–20:00, P4
Investigations on the relaxation of metallic glasses using fast scanning calorimetry — •Maximilian Demming1, Mark Stringe1, Martin Peterlechner1, Gerhard Wilde1, and Benedikt Bochtler2 — 1IMP Uni Münster — 2LMW Uni Saarland
During isothermal annealing below the glass transition, all glasses, and thus also metallic glasses, show relaxation effects that resemble the underlying trajectory in phase space towards metastable equilibrium. Using fast scanning calorimetry (FSC) it becomes feasible to investigate such phenomena over a wide range of rates and at very high controlled heating or cooling rates. The tremendous advantage of FSC in comparison to a conventional differential scanning calorimeter (DSC) is, that here one can reach cooling and heating rates up to several 10000 K/s, which makes in-situ quenching possible. Another advantage is that a large number of measurements can be performed in small time intervals. This makes the FSC quite interesting for experiments in thermic cycling with controlled heating and cooling rates. One special method is the so-called cryogenic cycling, which means, that a sample is periodically quenched and reheated between room and a cryogenic temperature. According to literature, this treatment, that has been termed as *cryogenic rejuvenation* could lead to markedly changed properties of the metallic glass. The materials investigated here are AuCuSiAg and PdNiS due to their low glass transition temperature and melting point. Here different relaxation states achieved by in-situ quenching via FSC are examined and compared to the relaxation behavior observed at conventional rates.