Page 116 - MSAM-4-2

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

80% porosity, to evaluate how multiple impacts (248 J) test parameters are summarized in Table 2 under the
influence their energy absorption capabilities. The specific heading M3. The experimental findings indicate that all
porous structure samples achieved complete densification
(sudden large spike of the red curve after the yield plateau
in Figure 12) after the multiple impacts at a high energy
level of 248 J. This behavior highlights a fundamental
characteristic of porous materials: Their ability to dissipate
energy through deformation and densification under high-
energy impacts. For the Dodeca structure, the Dodeca-A
7
P80 underwent a deformation of 6 mm after the multiple
impacts before attaining a fully dense state (Figure 12A). In
contrast, Dodeca-B and Dodeca-C reached their fully dense
states after undergoing 4.3 mm and 8.3 mm deformations,
respectively (Figure 12B and C). As illustrated in Figure 13,
Dodeca-C P80 demonstrated a remarkable 73.1% increase
in energy absorption compared to Dodeca-A P80,
showcasing an excellent impact response.
In the case of the Octa structures, the densification
process exhibited distinct variations. The Octa-A P80
structure initiated densification at a deformation of
Figure 11. Specific strength of laser powder bed fusion-built AlSi10Mg 8.6 mm, whereas the Octa-B P80 began this transition
Dodeca and Octa structures with 80% porosity at different unit cell
rotations at 9.6 mm (Figure 12D and E). Although Octa-A P80
Abbreviations: Dodeca: Dodecahedral; Octa: Octahedral entered the densification phase earlier than Octa-B P80,

A B C

D E

Figure 12. Comparison of force-displacement curves at an impact energy level of 124 J (black curve) and a multiplied energy level of 248 J (red
curve) for various laser powder bed fusion-built AlSi10Mg porous structures with 80% porosity. (A) Dodeca-A, (B) Dodeca-B, (C) Dodeca-C,
(D) Octa-A, and (E) Octa-B
Abbreviations: Dodeca: Dodecahedral; Octa: Octahedral

Volume 4 Issue 2 (2025) 12 doi: 10.36922/MSAM025130019