SKM 2023 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 18: Transport in Materials: Metals, Alloys and Oxides

MM 18.4: Talk

Tuesday, March 28, 2023, 12:15–12:30, SCH A 118

GP-zone formation and growth in rapidly quenched Al-Cu alloys — •David Stein, Johannes Berlin, Tobias Stegmüller, and Ferdinand Haider — Universität Augsburg, Institut für Physik, 86159 Augsburg, Germany

Natural aging by the formation of Guinier Preston zones in Al-Cu alloys is only possible in the presence of excess vacancies, quenched in from high temperatures. In collision welded samples of Al and Cu, an unexpected high density of GPII-zones was observed in the TEM. In order to obtain similarly high quenching rates of about 104 K/s, meltspinning was used for alloys with a Cu content from 2-5 wt%. After the quenching process, the samples were analyzed after different natural aging times using Differential Scanning Calometry (DSC) , hardness measurements, resistometry and STEM to obtain information about the unmixing kinetics. Additionally EDX and EBSD were used to characterize the microstructure and chemical homogeneity of the samples.