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MM: Fachverband Metall- und Materialphysik

MM 16: Poster Ia

MM 16.9: Poster

Montag, 18. März 2024, 18:30–20:30, Poster E

LPBF processed crack-free high-strength Al alloy — •Irena Paulin, Nejc Velikajne, Črtomir Donik, and Matjaž Godec — Institute of Metals and Technology, Lepi pot 11, Ljubljana, Slovenia

The ambitious goal of our research involves the development of a new high-strength Al alloy suitable for the AM process, which will facilitate the production of crack-free components combined with improved mechanical and corrosion properties. To achieve this goal, we prepared samples from commercially available AA7075 aluminium powder on a laboratory LBPF device. We changed various process parameters and optimized the production of simple samples in the form of 10x10x10 mm3 cubes, where we achieved the highest densities. Cracks were visible in all samples, regardless of the variety of process parameters used.

To avoid cracks, we process the samples at different temperatures of the preheated baseplate, where it turned out that higher temperatures do not have a favourable effect on the production of material without cracks. Surprisingly, lower preheating temperatures ensured better remelting in the material and thus less porosity in the material. In order to try to produce a material without cracks, in the next steps we started mixing AA7075 and AlSi12 powder, adding Si to the base material and thus reducing the difference in solidification temperature. Microstructural characterization showed that we successfully made a material without cracks.

Keywords: additive manufacturing; high-streinght aluminium alloy; microstructure characterization; process parametres