Metallurgical Abstracts on Light Metals and Alloys vol.57

Design and applications of additively manufactured porous aluminum alloys

Koichi Kitazono*, Ryoga Akimoto* and Masaya Iguchi*
* Graduate School of Systems Design, Tokyo Metropolitan University

[Published in Materials Transactions, Vol. 64, No. 3 (2023), pp. 334-340]

https://doi.org/10.2320/matertrans.mt-la2022051
E-mail: kitazono[at]tmu.ac.jp
Key Words: mechanical property, Voronoi division, porous metal, cellular solid

Additive manufacturing (AM) technology enables to manufacture many types of porous aluminum alloys. Present study focusses on AM porous Al-4.8Mg-0.7Sc alloys manufactured through laser powder bed fusion process. Eight types of ordered cell structures are designed by 3D-Voronoi division. The shapes of the unit-cells are truncated octahedron, rhombic dodecahedron and trapezo-rhombic dodecahedron. AM porous Al-4.8Mg-0.7Sc alloys consisting of ordered cells show anisotropic compression behavior. Oscillated stress-strain curves are due to the heterogeneous deformation of cell struts. Post-annealed AM porous Al-4.8Mg-0.7Sc alloy shows excellent mechanical properties compared to post-annealed AM porous Al-10Si-0.3Mg alloys. This is because of solid solution hardening in Al-4.8Mg-0.7Sc alloy.

Compressive stress-strain curves of AM porous Al-4.8Mg-0.7Sc alloy and AM porous Al-10Si-0.3Mg alloy. Unit-cell structures are fcc-Voronoi, rhombic dodecahedron.