Dresden 2020 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 18: Poster Session I

MM 18.10: Poster

Monday, March 16, 2020, 18:15–20:00, P4

Experimental investigation of the early stage precipitation reactions in Al-Cu alloys — •Johannes Berlin, Maximilian Gnedel, and Ferdinand Haider — Chair for Experimental Physics I, University of Augsburg, Universitätsstraße 1, 86159 Augsburg (Germany)

Due to their superior strength to weight ratio heat treatable Al-Cu alloys (2XXX-Series) are widely used particularly in aerospace industry. Although the occurring precipitates in these alloys are well known, the very early stages of formation and transformation mechanisms still are a topic of ongoing research. Transmission electron microscopy is used to investigate the influence of different parameters such as thermal history and additional plastic deformation on early stage precipitation in aluminum. Based on state-of-the-art transmission electron microscopy natural aging in form of growing GP-zones accelerated by excess vacancies can be examined, which was possible before only by diffraction experiments. In addition, DSC and hardness measurements are performed to evaluate the temper state of the specimens. The results are compared to numerical simulations. A better understanding of the precipitate formation mechanisms in these alloys for important future light-weight construction could be tuned more precisely regarding their intended use.