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A Study of the Mechanical Properties of Al6061-Zr1,2 Alloy Processed by Laser Beam Melting

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Abstract

The present paper proposes an experimental study to determine the mechanical properties of an additively manufactured modified Al6061 alloy, where the addition of 2 vol.% of yttrium-stabilized zirconia (YSZ) to Al6061 base powder allows to fully remove cracks during laser beam melting processing. To this end, Vickers tests, tensile tests, Charpy tests and microstructural analyses are used. With respect to the building direction, a quasi-isotropic response is highlighted, on as-built material with properties (engineering yield and ultimate strengths) higher than the wrought 6061 alloy. This improvement can be attributed to the extra-fine microstructure, a large dislocation density and a specific precipitation/solution trapping behavior associated with the Zr addition. Besides, the alloy showed excellent tensile response reproducibility. Thereafter, effect of post-heat treatments is investigated. Classic T6 from wrought alloys practice allowed to precipitate well-known and reported nano-β″-MgxSiy phases, improving the yield and ultimate strengths, but at the expense of significant grain coarsening. The mechanical properties are further increased through an adapted heat treatment, specifically designed for this Al6061 modified alloy. Al3Zr hardening nanoprecipitates are responsible of the improved yield response observed after an annealing for 2 h at 400 °C. The competition between these different hardening precipitation phases (nano-β″/nano-Al3Zr) is finally discussed.

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Acknowledgments

The TEM pictures were acquired at the CEA NanoCharacterization Platform (PFNC)—Minatec, thanks to the French RTB (IRT Nanoelec) and the equipex NanoID. The authors thanks Nathalie LADRAT for FIB lamella preparation. Céline RIBIERE is also acknowledged for her 3D printing technical assistance. M.O thanks Florian PEYROUZET for fruitful discussions.

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Opprecht, M., Roux, G., Garandet, JP. et al. A Study of the Mechanical Properties of Al6061-Zr1,2 Alloy Processed by Laser Beam Melting. J. of Materi Eng and Perform 32, 1840–1855 (2023). https://doi.org/10.1007/s11665-022-07218-0

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