Regensburg 2025 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 26: Topical Session: Thermophysical Properties of Bulk Metallic Glasses and Bulk Metallic Glass-forming Liquids

MM 26.4: Vortrag

Donnerstag, 20. März 2025, 11:00–11:15, H10

Structural evolution during annealing in a Zr-Cu-Al bulk metallic glass by X-ray absorption spectroscopy — •Andrea Fantin, Reza Rashidi, Birte Riechers, and Robert Maaß — Bundesanstalt fuer Materialforschung und -pruefung, Unter den Eichen 87, 12205 Berlin, Germany

Understanding structural evolution in the time-temperature-transformation diagrams of bulk metallic glasses (BMGs) is crucial to tackle common challenges in glass science such as embrittlement and mechanical failure. Preliminary extended X-ray absorption spectroscopy fine structure (EXAFS) measurements carried out at the Zr and Cu K-edges on a typical Zr-Cu-Al system allowed following the evolution of element-specific bond lengths, static and dynamic disorder, and nearest-neighbor numbers as a function of temperature and time. Data on the as-cast BMG, on further annealed BMG at two different temperatures (0.9Tg and 1.02Tg) and at different holding times was collected (ex-situ) at the BM-08 beamline, ESRF, finally showing two different behaviors depending on the temperature used, which will be described in terms of EXAFS fitting parameters during the presentation.

Keywords: Local atomic structure; Short-range ordering; X-ray absorption spectroscopy; Structural evolution; Time-temperature-transformation diagram