Regensburg 2019 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 29: Microstructure and Phase Transformations

MM 29.12: Vortrag

Mittwoch, 3. April 2019, 18:00–18:15, H46

Aging Processes in an Al(Mg,Si) Alloy Studied by Positron Annihilation Lifetime Spectroscopy — •Laura Resch, Gregor Klinser, Robert Enzinger, Elisabeth Hengge, Wolfgang Sprengel, and Roland Würschum — Institute of Materials Physics, Graz University of Technology, Graz, Austria

Despite the great relevance of age hardenable aluminium alloys, the atomistic processes, i.e. the formation of precipitations, underlying the age hardening are not fully understood yet. Especially, for the investigation of the initial stages and the sequence of precipitation, positron-electron annihilation has been proven to be a very suitable tool. In the present study[1] the specific technique of positron annihilation lifetime spectroscopy is applied to investigate artificial aging of the commercial Al(Mg,Si) alloy (EN-AW6060). On short timescales a variation of the positron lifetime is observed, which is correlated with a characteristic increase in length, as monitored by in-situ dilatometry. Furthermore, the well-known aging characteristics of the hardness turned out to be directly related to the positron data. The results give hints on the early cluster formation processes. This kind of investigation allows comprehensive analyses of the aging of aluminium alloys within different time scales as well as temperature regimes, which is important for the development of novel, tailored commercial light weight alloys.

[1] L. Resch, G. Klinser, E. Hengge, R. Enzinger, M. Luckabauer, W. Sprengel, R. Würschum, Journal of materials science 53, 14657(2018).