SKM 2023 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 28: Liquid and Amorphous Metals
MM 28.1: Vortrag
Mittwoch, 29. März 2023, 10:15–10:30, SCH A 118
Relation between decoupled α and β relaxation processes and medium-range ordering in Pd40Ni40P20 bulk metallic glasses — •Manoel Wilker da Silva Pinto, Mark Stringe, Dražen Radić, Harald Rösner, and Gerhard Wilde — Institut für Materialphysik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany
Individual annealing treatments at 0.8Tg and 0.9Tg on Pd40Ni40P20 bulk metallic glass samples were performed in a differential scanning calorimeter to either activate mainly β or both α and β relaxation processes. Prior to and after these measurements the samples were heated into the supercooled liquid in order to establish a comparable reference relaxation state.
The medium-range order of the different stages of the amorphous structures were investigated by fluctuation electron microscopy and compared with that of the as-cast state. The results indicate that first, a defined structural reset was achieved when heating into the supercooled liquid; however, with increased strain due reduction of excess volume. Second, the annealing treatment at 0.8Tg increases the volume fraction of medium-range order again with annealing time and third, a depletion of the volume fraction is observed after annealing at 0.9Tg.