Berlin 2024 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 60: Topical Session: In Situ and Multimodal Microscopy in Materials Physics III
MM 60.8: Vortrag
Donnerstag, 21. März 2024, 17:45–18:00, C 130
Correlative structural and thermal analysis of Zr-based bulk metallic glasses — •Štefan Stanko1, Jürgen Schawe1,2, and Jörg Löffler1 — 1Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland — 2Mettler-Toledo GmbH, Analytical, 8606 Nänikon, Switzerland
Bulk metallic glasses (BMGs) are metallic alloys with a disordered atomic arrangement, obtained via rapid cooling from the melt. Due to their unique properties, BMGs have recently become candidates for additive manufacturing methods such as laser powder-bed fusion (LPBF). In this work, we performed fast differential scanning calorimetry (FDSC) experiments to investigate the crystallization behavior of industrial-grade Zr-based BMGs applied in additive manufacturing. Using a modified FDSC sample holder to allow its integration into a synchrotron X-ray beam, time-temperature-transformation (TTT) diagrams were measured simultaneously with the alloy microstructure. Ex situ scanning electron microscopy (SEM) analysis of the samples exposed to the beam revealed that sample degradation during thermal cycling cannot be avoided even when using argon atmosphere. Therefore, TTT diagrams measurements were also performed in a device integrating the FDSC within an SEM, to investigate the degradation in situ. The results were correlated with the oxygen content of the alloys to optimize the additive manufacturing process.
Keywords: metallic glasses; fast calorimetry; in situ; X-ray diffraction; electron microscopy