Design and Applications of Additively Manufactured Porous Aluminum Alloys

Abstract

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. 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 alloy. 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 specimens. Cell structures are (a) bcc-Voronoi, (b) fcc-Voronoi, and (c) hcp-Voronoi.