Regensburg 2022 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 3: Microstructures and Phase Transformations: Metals & Alloys
MM 3.7: Vortrag
Montag, 5. September 2022, 12:00–12:15, H45
Structural and thermal characterisation of a AuGe alloy via electron microscopy and fast differential scanning calorimetry — •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
A device combining scanning electron microscopy (SEM) and fast differential scanning calorimetry (FDSC) was developed to perform in situ characterisation of metastable phase transformations. The potential of this device is demonstrated on the example of a AuGe eutectic alloy. Upon rapid cooling, the alloy forms the metastable crystalline phases β and γ and an amorphous phase. A thin lamella for transmission electron microscopy (TEM) was produced from a sample prepared in FDSC to further characterise the microstructure of the alloy beyond the capabilities of the in situ device. Ex situ FDSC experiments were performed using cooling and heating rates of several 1000 K/s to characterise the thermal behaviour of the β and γ phase. The transformation kinetics of the metastable phases was investigated. Finally, we show that we can prepare the glassy phase in FDSC and determine its thermophysical properties.