Page 119 - MSAM-4-2

Materials Science in Additive Manufacturing Impact of cell angle on AlSi10Mg structures

Figure 15. Impact velocity of the falling hammer as a function of strain for different single-unit cell structures
Abbreviations: Dodeca: Dodecahedral; Octa: Octahedral

4. Conclusion absorption and impact resistance. Porous structures that
experience a slight decrease in porosity of 10% (from 90%
In this study, AlSi10Mg was utilized as the base material, to 80%) exhibit significantly higher energy absorption
and a series of porous structures were designed using and better impact resistance while maintaining their
the Voronoi algorithm. These structures were fabricated
using LPBF. The dynamic mechanical behavior of the lightweight features.
porous structures with 80% and 90% porosity levels was The impact resistance of certain structures can be
investigated, considering varying single-unit cell rotation enhanced by rotating single-unit cells, though this
angles under different impact energies. approach is not universally applicable. Adjusting the

The SEM images reveal a typical LPBF-built AlSi10Mg rotation angle improves the impact resistance of Dodeca
microstructure with no apparent manufacturing defect series structures, such as the Dodeca-C structure, which
pores. The X-CT results indicate that LPBF process benefits from a 90° rotation about the Y-axis. In contrast,
parameters have a negligible effect on the dimensional the rotation negatively affects the impact resistance of the
resolution, particularly the porosity consistency, of Octa-B structure, leading to decreased performance.
LPBF-built Dodeca and Octa AlSi10Mg structures with The results demonstrate significant enhancements
different single-unit cell angle rotations. This consistency in energy absorption, SEA, and specific strength, which
ensures that variations in mechanical performance are increase by approximately 18.9% (P90), 17.1% (P90), and
primarily influenced by structural design rather than 79.5% (P80), respectively, for the rotated single-unit cell
inconsistencies in defects or porosity levels. Dodeca-C structure compared to the original Dodeca-A
Porosity level is inversely proportional to energy counterpart at an impact energy of 124 J. Furthermore,

Volume 4 Issue 2 (2025) 15 doi: 10.36922/MSAM025130019