SKM 2023 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 11: Crystal Structure Defects / Real Structure / Microstructure

KFM 11.6: Vortrag

Donnerstag, 30. März 2023, 15:40–16:00, POT 51

Monitoring the S-phase formation in an high-purity Al-Cu-Mg alloy by truncation during heating-up — •Torsten E.M. Staab, Dominik Boras, Sebastian Breitfelder, and Timo Strobl — IFB, Julius-Maximilians Universität Würzburg, 97070 Würzburg, Röntgenring 11

We are presenting a novel attempt to combine in-situ and ex-situ measurements for aluminum alloys. As a model alloy we have chosen an Al-1.7Cu-1.3Mg (at.%) alloy, which has been cast from high purity elements (5N5 Al, 4N Cu and 4N Mg). As basic method DSC (heating ramp: 5 K/min) has been employed to determine different states during S-phase formation: onset, maximum of the exothermal peak, end of exothermal reaction. Sample states were frozen-in by an abrupt truncation of the heating ramp (5 K/min), i.e. cooling quickly to room temperature. So, the current sample state is frozen-in. After truncation all samples have been measured without further preparation by X-ray diffraction (XRD) and positron annihilation lifetime spectroscopy (PALS). Thus we could correlate exactly different sample states, which is impossible by conventional experiments, i.e. heating to a certain temperature and then holding a certain time. This paves the way to investigate defined and comparable sample states by methods, which require an extensive sample preparation, like TEM or 3DAP, and in-situ methods like DSC or XRD at synchrotron beamlines.