Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 22: Poster session I

MM 22.12: Poster

Montag, 20. März 2017, 19:00–20:00, P4

Transmission electron microscopic examination of the precipitation growth in aluminium 2195 — •Johannes Luderschmid, Christian Felber, and Ferdinand Haider — Universität Augsburg, Institut für Physik, 86135 Augsburg

For aerospace applications the aluminium alloy 2195 is due to its alloying elements and microstructure one of the most interesting materials, as it shows a high strength and simultaneously a low density. Especially the formation of precipitates (T1 phase (Al2CuLi) and θ' phase (Al2Cu)) controls the strength of the material. The formation of precursors like solute enriched regions (Guinier-Preston Zones) at room temperature is a further ability of the aluminium alloy 2195. In this study the influence of different pre-treatment (natural aging, direct quenching) and different annealing conditions (time, temperature) after the solution annealing is studied with respect to the T1 and θ' precipitation growth. In particular the influence of natural aging is investigated, as here precursor phases are formed, which already reduce the chemical driving force for the further precipitation growth during the heat treatment. The kinetics of precipitate formation and growth were investigated using transmission electron microscopy and differential scanning calorimetry. The temperature and the time are the critical parameter for a diffusion process like the precipitate growth. For that reason these parameters were modified for the heat treatment in order to identify a difference in the growing of the precipitations.