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MM: Fachverband Metall- und Materialphysik
MM 22: Liquid and Amorphous Metals - Metallic Glass
MM 22.2: Vortrag
Dienstag, 17. März 2020, 10:30–10:45, IFW D
Effects of pretreatments on the mechanical properties of metallic glasses — •Hongbo Zhou1, Yuriy Mitrofanov2, and Gerhard Wilde1 — 1Institute of Materials Physics, University of Muenster, Wilhelm-Klemm Strasse 10, Muenster 48149, Germany — 2Department of General Physics, State Pedagogical University, Lenin Street 86, Voronezh 394043, Russia
Pretreatments including annealing and plastic deformation have a significant influence on the microstructure and non-equilibrium state of metallic glasses such as medium range order and the rejuvenation behavior. Therefore, connecting these influences to the resulting mechanical properties seems very promising to help understanding some basic issues, such as the structural origin of plasticity, heat effects and shear modulus softening. In this work, the samples were pretreated by low-temperature annealing, high-pressure torsion and cold rolling. The energetical state and thermal properties of metallic glasses were evaluated by differential scanning calorimetry and a physical property measurement system. Three-point bending, compression and shear modulus tests were carried out. The relation between mechanical properties and thermal properties was discussed. In addition, the differential scanning calorimetry curve can be reconstructed with the shear modulus data within the framework of the interstitialcy theory, which demonstrates the similar structural origins of the heat effect and shear modulus softening in metallic glasses.